feat: Add CI environment setup and verification workflows with Docker support

.github/actions/setup-ci-metadata/action.yaml

@@ -0,0 +1,70 @@
+name: 'Setup CI metadata'
+description: 'Composite action to derive the registry and CI image tag for the current repository.'
+inputs:
+  registry:
+    description: 'Container registry derived from the current GitHub server URL'
+    required: false
+    default: ''
+  repository:
+    description: 'GitHub repository in the format owner/repo'
+    required: false
+    default: ${{ github.repository }}
+  image_tag:
+    description: 'Tag for the CI image'
+    required: false
+    default: 'latest'
+outputs:
+  registry:
+    description: 'Container registry derived from the current GitHub server URL'
+    value: ${{ steps.setup.outputs.registry }}
+  image_tag:
+    description: 'Fully qualified CI image tag'
+    value: ${{ steps.setup.outputs.image_tag }}
+  latest_tag:
+    description: 'Fully qualified latest CI image tag'
+    value: ${{ steps.setup.outputs.latest_tag }}
+runs:
+  using: 'composite'
+  steps:
+    - name: Setup Dynamic Metadata
+      id: setup
+      shell: bash
+      run: |
+        # Extract the domain from server_url, handling both https:// and ssh:// schemes
+        SERVER_URL="${{ github.server_url }}"
+
+        if [[ "$SERVER_URL" =~ ^ssh:// ]]; then
+          # For SSH URLs like ssh://git@host:port/path, extract just the hostname
+          SERVER_DOMAIN=$(echo "$SERVER_URL" | sed -e 's|^ssh://||' -e 's|^[^@]*@||' -e 's|:[0-9]*.*||')
+        else
+          # For HTTPS URLs, extract domain without scheme
+          SERVER_DOMAIN=$(echo "$SERVER_URL" | sed -e 's|^[^/]*//||' -e 's|/.*$||')
+        fi
+
+        echo "Extracted server domain: $SERVER_DOMAIN"
+
+        if [[ -n "${{ inputs.registry }}" ]]; then
+          REGISTRY="${{ inputs.registry }}"
+        elif [[ "$SERVER_DOMAIN" == "github.com" ]]; then
+          REGISTRY="ghcr.io"
+        else
+          REGISTRY="$SERVER_DOMAIN"
+        fi
+
+        # Extract owner/repo from github.repository, handling SSH URLs
+        REPO="${{ inputs.repository }}"
+        if [[ "$REPO" =~ ^ssh:// ]] || [[ "$REPO" =~ ^https:// ]]; then
+          # Extract owner/repo from URLs like ssh://git@host/owner/repo.git or https://host/owner/repo.git
+          REPO=$(echo "$REPO" | sed -e 's|^[^/]*/||' -e 's|\.git$||' | rev | cut -d'/' -f1,2 | rev)
+        fi
+
+        # Docker image names must be lowercase
+        REGISTRY="${REGISTRY,,}"
+        REPO="${REPO,,}"
+
+        IMAGE_TAG="${REGISTRY}/${REPO}/ci:${{ inputs.image_tag }}"
+        LATEST_TAG="${REGISTRY}/${REPO}/ci:latest"
+
+        echo "registry=$REGISTRY" >> "$GITHUB_OUTPUT"
+        echo "image_tag=$IMAGE_TAG" >> "$GITHUB_OUTPUT"
+        echo "latest_tag=$LATEST_TAG" >> "$GITHUB_OUTPUT"