Use the new, prettier short URLs.

* sxw/issue25:
  Add documentation for the `script=` variable

* nl6720/pacman6:
  configs/*/pacman.conf: update configuration file for pacman 6

Based on https://github.com/archlinux/svntogit-packages/blob/accc1d210133a933f2b26e0aad842c27d00c8b0c/trunk/pacman.conf

Implements #136

* nl6720/ARCHISO_GNUPG_FD-unbound-variable:
  mkarchiso: fix unbound variable when not using GPG signing

Fixes #138

* nl6720/env-i:
  archiso/mkarchiso: clear environment variables when chrooting

Environment variables can interfere with the commands in chroot.
This causes issues when the environment variables specify a path that does not exist inside the chroot, e.g. if TMPDIR is set to a custom value.

Fixes https://bugs.archlinux.org/task/70580 .

* changelog/55:
  Add changelog for v55

CHANGELOG.rst:
Add changelog entries for v55.

* mr/118:
  Add pv to the list of releng packages

configs/releng/packages.x86_64:
Add pv, as it was not added in the context of !118.

* nl6720/baseline-erofs:
  configs/baseline: use EROFS based image

Showcase #59.

* nl6720/networkd-replace-type-with-name:
  configs/releng/airootfs/etc/systemd/network/: match by globbing the interface name instead of matching the type

configs/releng/airootfs/etc/systemd/network/: match by globbing the interface name instead of matching the type

Type=ether matches virtual Ethernet interfaces (veth*) which may break networking inside containers.

Fixes https://bugs.archlinux.org/task/70892 .

Partially reverts 8a521d0b .

* issues/135:
  Adjust documentation on IRC support channel

README.rst:
Update the documentation on IRC support channel, after Arch Linux has moved to Libera Chat.

* sxw/copytoram:
  Apply copytoram Boot Option Menu Entries also to releng
  Fence add_binary for pv
  Reorder UEFI boot menu entries
  Update README.bootparams
  Apply 1 suggestion(s) to 1 file(s)
  add optional pv tool

Explain the purpose of optionally adding the "pv" program to the package
list.

use pv to give feedback on copying the airootfs to RAM when copytoram
kernel parameter is given

CHANGELOG.rst:
Add changelog entry for v54.

.gitlab-ci.yml:
Use environment variables to override the build settings offered by the build-host.sh script.
Lower the RAM usage of the builds to 3072.
Lower the COW space used by archiso to 2GiB.
Remove dependency on libisoburn in the `before_script` section of the build target (libarchive and util-linux have
replaced this requirement).
Use size units in accordance with upstream documentation.
Use the new name of the build's metrics file.

Fixes #134

.gitlab/ci/build-host.sh:
Change all script-local variables to lower-case and make some of them overridable using environment variables (by
providing defaults).
Break down overly long commands by splitting them into a list of strings.
Use local variables where possible.
Change `main()` to use rsync instead of cp to copy the project to the build location more generically.
Change `main()` to use rsync instead of cp to copy the build artifacts on the VM from the project's build directory to
the output.
Remove all unnecessary `function` keywords for function declarations.
Replace the dependency on libisoburn's `xorriso` with libarchive's `bsdtar` and util-linux's `blkid` in
`prepare_boot()`.
Add `print_section_start()` and `print_section_end()` to reduce code duplication and error potential when printing lines
for gitlab's collapsible sections (https://docs.gitlab.com/ee/ci/jobs/#custom-collapsible-sections).
Document the script's behavior and expectations.
Document the understood environment variables and add links to documentation on understood units (in case of size
units).

.gitlab/ci/build-inside-vm.sh:
Add `print_section_start()` and `print_section_end()` to remove code duplication when printing gitlab collapsible
sections (https://docs.gitlab.com/ee/ci/jobs/#custom-collapsible-sections).
Document further script dependencies.
Remove the temporary directory base (located in the project directory) instead of only the tempdir.
Simplify setting file and directory ownership when running with sudo, by only doing it once, recursively on the output
directory.
Make the script's output more verbose by using verbose flags for removal, ownership changes and zsyncmake actions and by
displaying e.g. created metrics and checksum files.
Change `create_metrics()` to output to a `metrics.txt` by default.
Change `create_checksums()` to create the checksums relative to the files.

If the keyring is not specified, pacman-key will simply use all keyrings from /usr/share/pacman/keyrings/.

Fixes #133.

configs/releng/packages.x86_64: explicitly add wanted packages instead of relying on pulling them in as dependencies

Fixes #119.

* virtualbox-guest-utils-nox package and vboxservice.service for VirtualBox.
* qemu-guest-agent package and qemu-guest-agent.service for QEMU & libvirt.

Implements #118.

.gitlab-ci.yml:
Expand the parallel matrix with build modes per profile.
Do not run netboot with the baseline profile, as codesigning is not supported yet (#132).
Remove tagging secure, as archiso builds will only ever be used for testing the project.
Build ISOs using fast-single-thread (they take very long otherwise and hit the job time limit) and use any available
runner for anything else.

.gitlab/ci/build-inside-vm.sh:
Expand the script to allow building based on mkarchiso's buildmodes.
Accept two parameters now: profile and buildmode.

Add gitlab collapsable sections by adding specific printfs for it to all functions.
Add extglob to be able to more specifically target files.
Change `create_checksums()` to also generate the legacy md5 and sha1 checksums.
Change `create_checksums()` and `create_zsync_delta()` to accept and process an unspecified amount of files as
parameters.
Change `create_zsync_delta()` to lower the blocksize when creating a file for the bootstrap image.
Change `create_metrics()` to create metrics depending on build mode.
Rename `create_temp_pgp_key()` to `create_ephemeral_pgp_key()`.
Add `create_ephemeral_codesigning_key()` to create a codesigning key, that is used to sign the netboot artifacts.
Change `run_mkarchiso()` to also create an ephemeral codesigning key before running mkarchiso and to run
`create_checksums()` and `create_zsync_delta()` with files depending on build mode.

.gitlab/ci/build-host.sh:
Call `build-inside-vm.sh` using the PROFILE and BUILDMODE environment variables as parameters.

archiso/mkarchiso:
Change `_make_pkglist()` to also generate the package list when using the netboot build mode.

README.rst:
Add openssl as another dependency.
Mention the export of netboot artifacts in the project introduction.
Mention that archiso may be used on other operating systems as well.

docs/README.profile.rst:
Add documentation for the netboot buildmode.

archiso/mkarchiso:
Implement a buildmode to export artifacts required for netboot with IPXE.
When providing the buildmode 'netboot' via profiledef.sh or the `-m` option, all targets necessary to create an ISO
medium are built, but the components required for netboot are exported to the output dir.
Optionally, it is possible to provide a set of certificates for codsigning using the `-c` option, where the first file
is considered as the signer certificate and the second as the key.

Add `_export_netboot_artifacts()` to copy build artifacts to the output directory.
Add `_sign_netboot_artifacts()` to codesign the netboot artifacts in the work directory.
Add `_validate_requirements_buildmode_netboot()` to check for openssl.
Add `_build_iso_base()` to implement common function calls between the 'iso' and the 'netboot' buildmodes.
Add `_build_buildmode_netboot()` to make use of `_build_iso_base()`, (optionally) `_sign_netboot_artifacts()` and
`_export_netboot_artifacts()`.
Change `_build_buildmode_iso()` to make use of `_build_iso_base()`.
Add `-c` as an option to mkarchiso to read in a list of file names.
Unify the output of `_usage()` by using the same definition style for lists of strings provided to options that accept
them (e.g. `-c`, `-m`, `-p`).

Closes #128

README.rst:
Mention bootstrap images in the opening words of the project documentation.
Add awk, erofs-utils, findutils, gzip, libarchive, pacman and sed to dependencies.