rework CI workflow for missing installations to only check whether eb_hooks.py is up-to-date

.github/workflows/test-eb-hooks.yml

@@ -0,0 +1,58 @@
+# documentation: https://help.github.com/en/articles/workflow-syntax-for-github-actions
+name: Check whether eb_hooks.py script is up-to-date
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+permissions:
+  contents: read # to fetch code (actions/checkout)
+env:
+  EESSI_VERSION: '2023.06'
+jobs:
+  check_eb_hooks:
+    runs-on: ubuntu-24.04
+    steps:
+        - name: Check out software-layer repository
+          uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+          with:
+              fetch-depth: 0  # Fetch all history for all branches and tags
+
+        - name: Show host system info
+          run: |
+            echo "/proc/cpuinfo:"
+            cat /proc/cpuinfo
+            echo
+            echo "lscpu:"
+            lscpu
+
+        - name: Mount EESSI CernVM-FS pilot repository
+          uses: cvmfs-contrib/github-action-cvmfs@55899ca74cf78ab874bdf47f5a804e47c198743c # v4.0
+          with:
+              cvmfs_config_package: https://github.com/EESSI/filesystem-layer/releases/download/latest/cvmfs-config-eessi_latest_all.deb
+              cvmfs_http_proxy: DIRECT
+              cvmfs_repositories: software.eessi.io
+
+        - name: Check that EasyBuild hook is up to date
+          if: ${{ github.event_name == 'pull_request' }}
+          run: |
+              FILE="eb_hooks.py"
+              TEMP_FILE="$(mktemp)"
+
+              # Fetch base branch
+              git fetch origin ${{ github.base_ref }}
+
+              # Check if the hooks has changed in the PR
+              if git diff --name-only origin/${{ github.base_ref }}...HEAD | grep -q "^$FILE$"; then
+                echo "Hooks changed in PR. Using PR version."
+                cp "$FILE" "$TEMP_FILE"
+              else
+                echo "File not changed in PR. Using default branch version."
+                git show origin/${{ github.base_ref }}:$FILE > "$TEMP_FILE"
+              fi
+
+              # Compare the hooks to what is shipped in the repository
+              # (it is overkill, but harmless, to do this for every architecture)
+              export EESSI_SOFTWARE_SUBDIR_OVERRIDE=${{matrix.EESSI_SOFTWARE_SUBDIR_OVERRIDE}}
+              source /cvmfs/software.eessi.io/versions/${EESSI_VERSION}/init/bash
+              module load EESSI-extend
+              diff "$TEMP_FILE" "$EASYBUILD_HOOKS"