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(gitlab ci) Added a CA structure to the codesigning certificates. This to test the functionality of optional CA being in the signing message. (mkarchiso) Removed the ``sign_netboot_artifacts`` variable and instead we'll now rely on ``if [[ -v cert_list ]]; then``. Added ``ARCHISO_TLS_FD`` and ``ARCHISO_TLSCA_FD`` environment variables to override the certificates used. This is so that third party CA's can be used during building in a meaningful way without distrupting the CA trust that is shipped by default. _cms_sign_artifact() was added which signs the rootfs using OpenSSL CMS. The files will be saved as "${artifact}.cms.sig". That would be for instance "${isofs_dir}/${install_dir}/${arch}/airootfs.sfs.cms.sig".
