test(get-magento-version): document and pin what happens in various kinds of installs

get-magento-version/action.yml

@@ -22,22 +22,7 @@ runs:
   - name: Compute Installed Magento version
     id: get-magento-version
     shell: bash
-    working-directory: ${{ inputs.working-directory }}
-    run: |
-      PATTERN="magento/product-(community|enterprise)-edition|mage-os/product-community-edition"
-
-      if [ -f composer.lock ]; then
-        RESULT=$(jq -r --arg p "$PATTERN" '.packages[] | select(.name | test($p)) | "\(.name) \(.version)"' composer.lock | head -1)
-      else
-        RESULT=$(jq -r --arg p "$PATTERN" '.require | to_entries[] | select(.key | test($p)) | "\(.key) \(.value)"' composer.json | head -1)
-      fi
-
-      PRODUCT=$(echo "$RESULT" | awk '{print $1}')
-      VERSION=$(echo "$RESULT" | awk '{print $2}' | sed 's/^v//')
-      PROJECT=$(echo "$PRODUCT" | sed 's/product-/project-/')
-
-      echo "version=\"$VERSION\"" >> $GITHUB_OUTPUT
-      echo "project=$PROJECT" >> $GITHUB_OUTPUT
+    run: bash "${{ github.action_path }}/get-magento-version.sh" "${{ inputs.working-directory }}" >> $GITHUB_OUTPUT
 
 branding:
   icon: "code"