created generic-ci script and refactored file permissions

set executables executable and created a generic-ci.sh script.
With this script we are able to use travis or github actions
or any other ci system.

Signed-off-by: Christian Rebischke <chris@nullday.de>

.github/workflows/main.yml

+name: CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: install packer
+      run:
+        ./generic-ci.sh install
+    - name: verify packer configuration
+      run:
+        ./generic-ci.sh verify

generic-ci.sh

+#!/bin/bash
+
+case $1 in
+
+  install)
+    PACKER_CURRENT_VERSION="$(curl -s https://checkpoint-api.hashicorp.com/v1/check/packer | jq -r -M '.current_version')"
+    PACKER_URL="https://releases.hashicorp.com/packer/$PACKER_CURRENT_VERSION/packer_${PACKER_CURRENT_VERSION}_linux_amd64.zip"
+    PACKER_SHA256="https://releases.hashicorp.com/packer/$PACKER_CURRENT_VERSION/packer_${PACKER_CURRENT_VERSION}_SHA256SUMS"
+    PACKER_SHA256_SIG="https://releases.hashicorp.com/packer/$PACKER_CURRENT_VERSION/packer_${PACKER_CURRENT_VERSION}_SHA256SUMS.sig"
+    HASHICORP_FINGERPRINT=91a6e7f85d05c65630bef18951852d87348ffc4c
+    HASHICORP_KEY="https://keybase.io/hashicorp/pgp_keys.asc?fingerprint=${HASHICORP_FINGERPRINT}"
+    wget "${PACKER_URL}"
+    wget "${PACKER_SHA256}"
+    wget "${PACKER_SHA256_SIG}"
+    wget -O hashicorp.key "${HASHICORP_KEY}"
+    gpg --with-fingerprint --with-colons hashicorp.key | grep ${HASHICORP_FINGERPRINT^^}
+    gpg --import hashicorp.key
+    gpg --verify "packer_${PACKER_CURRENT_VERSION}_SHA256SUMS.sig" "packer_${PACKER_CURRENT_VERSION}_SHA256SUMS"
+    grep "linux_amd64 packer_${PACKER_CURRENT_VERSION}_SHA256SUMS" >packer_SHA256SUM_linux_amd64
+    sha256sum --check --status packer_SHA256SUM_linux_amd64
+    unzip "packer_${PACKER_CURRENT_VERSION}_linux_amd64.zip"
+    ;;
+
+  verify)
+    ./packer --version
+    jq ".\"post-processors\"[0] |= map(select(.\"type\" != \"vagrant-cloud\"))" vagrant.json | ./packer validate -var "iso_url=https://downloads.archlinux.de/iso/$(date +'%Y.%m').01/archlinux-$(date +'%Y.%m').01-x86_64.iso" -var "iso_checksum_url=https://downloads.archlinux.de/iso/$(date +'%Y.%m').01/sha1sums.txt" -
+    ;;
+
+  *)
+    exit 1
+    ;;
+esac