Automate image release (#671)

* bump OpenHPC snapshots to v3.1.1 (slurm 24.11.5) and v2.9.1 (slurm 23.11.11) for CVE-2025-43904

* bump CI image

* extend timeout for slurmdbd startup to cope with major version upgrade on startup

* configure openhpc for slurmdbd backup/update

* support mysql tasks in openhpc role

* remove slurmdbd startup timeout increase - got borked during merge from main

* mysql package now installed separately in role from openhpc_packages

* bump CI image to get mysql client installed

* delete snapshot when cleaning up in CI

* automate image release

Author: sjpb

.github/workflows/release-image.yml

@@ -0,0 +1,37 @@
+name: Release images
+on:
+  workflow_dispatch:
+  release:
+    types:
+      - published # should work for both pre-releases and releases
+env:
+  IMAGE_PATH: environments/.stackhpc/tofu/cluster_image.auto.tfvars.json
+jobs:
+  ci-image-release:
+    name: ci-image-release
+    runs-on: ubuntu-22.04
+    concurrency: ${{ github.workflow }}-${{ github.ref }}
+    strategy:
+      fail-fast: false
+      matrix:
+        build:
+          - RL8
+          - RL9
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Write s3cmd configuration
+        run: echo "${{ secrets.ARCUS_S3_CFG }}" > ~/.s3cfg
+
+      - name: Install s3cmd
+        run: |
+          sudo apt-get update
+          sudo apt-get --yes install s3cmd
+      
+      - name: Retrieve image name
+        run: |
+          TARGET_IMAGE=$(jq --arg version "${{ matrix.build }}" -r '.cluster_image[$version]' "${{ env.IMAGE_PATH }}")
+          echo "TARGET_IMAGE=${TARGET_IMAGE}" >> "$GITHUB_ENV"
+      
+      - name: Copy image from pre-release to release bucket
+        run: s3cmd cp s3://openhpc-images-prerelease/${{ env.TARGET_IMAGE }} s3://openhpc-images