Add success flags to workflows

.github/workflows/build-push-attest-docker.yml

@@ -6,6 +6,10 @@ on:
       release:
         required: true
         type: string
+    outputs:
+      success:
+        description: "Did the flow succeed?"
+        value: ${{ jobs.publish.outputs.success }}
 
 jobs:
   publish:
@@ -16,6 +20,8 @@ jobs:
       contents: read
       attestations: write
       id-token: write
+    outputs:
+      success: ${{ steps.set_flag.outputs.success }}
     steps:
       - name: Check out the repo
         uses: actions/checkout@v4
@@ -58,3 +64,7 @@ jobs:
           subject-name: ghcr.io/${{ github.repository }}
           subject-digest: ${{ steps.push.outputs.digest }}
           push-to-registry: true
+
+      - name: Set success flag
+        id: set_flag
+        run: echo "success=true" >> "$GITHUB_OUTPUT"

.github/workflows/create-release.yml

@@ -5,6 +5,9 @@ on:
       release_name:
         description: "Name of the created release"
         value: ${{ jobs.create_release.outputs.release_name }}
+      success:
+        description: "Was the release created successfully?"
+        value: ${{ jobs.create_release.outputs.success }}
 
 jobs:
   create_release:
@@ -12,6 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       release_name: ${{ steps.tag_version.outputs.new_tag }}
+      success: ${{ steps.set_flag.outputs.success }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -41,3 +45,7 @@ jobs:
           name: ${{ steps.tag_version.outputs.new_tag }}
           body: ${{ steps.tag_version.outputs.changelog }}
           generateReleaseNotes: true
+
+      - name: Set success flag
+        id: set_flag
+        run: echo "success=true" >> "$GITHUB_OUTPUT"