Add image digest as output

.gitea/workflows/rust-kubernetes.yaml

@@ -13,6 +13,10 @@ on:
       webhook_url:
         description: Webhook to call after build is completed
         type: string
+    outputs:
+      digest:
+        description: Digest of the build docker container
+        value: ${{ jobs.build.outputs.digest }}
 
 env:
   OCI_REPO: git.huizinga.dev/dreaded_x/${{ gitea.event.repository.name}}
@@ -21,6 +25,8 @@ jobs:
   build:
     name: Build container and manifests
     runs-on: ubuntu-latest
+    outputs:
+      digest: ${{ steps.build.outputs.digest }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4