Build qcow2 on release

.github/workflows/packer.yml

@@ -7,6 +7,9 @@ on:
   pull_request:
     branches:
       - main
+  release:
+    types:
+      - created
 
 env:
   PACKER_VERSION: "latest"
@@ -105,12 +108,13 @@ jobs:
           echo "Release keyword not found."
           echo "release_found=false" >> $GITHUB_ENV
         fi
-        echo "Push Message=${{ github.event.push.head_commit.message }}"
-        if [[ "${{ github.event.push.head_commit.message }}" == *"release"* ]]; then
-          echo "Release keyword found."
+
+    - name: Check if release event
+      id: check_release
+      run: |
+        if [[ "${{ github.event_name }}" == "release" ]]; then
           echo "release_found=true" >> $GITHUB_ENV
         fi
-        
 
     - name: Enable KVM group perms
       if: env.release_found == 'true'