Update docker-build.yml: run on forgerunner host label, fix doubled image path

.gitea/workflows/docker-build.yml

@@ -1,13 +1,16 @@
 name: Build and Push Docker Image
+
 on:
   push:
     branches: [main]
+  workflow_dispatch:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
-    container:
-      image: catthehacker/ubuntu:act-latest
+    # Run directly on the forgerunner host: the bundled Docker CLI and the
+    # mounted /var/run/docker.sock are available, so no nested-container or
+    # socket juggling is needed.
+    runs-on: host
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -21,5 +24,8 @@ jobs:
 
       - name: Build and Push
         run: |
-          docker build -t registry.alwisp.com/${{ gitea.repository_owner }}/${{ gitea.repository }}:latest .
-          docker push registry.alwisp.com/${{ gitea.repository_owner }}/${{ gitea.repository }}:latest
+          # gitea.repository is already "owner/repo" (e.g. jason/breedr).
+          IMAGE="registry.alwisp.com/${{ gitea.repository }}"
+          docker build -t "${IMAGE}:latest" -t "${IMAGE}:${{ gitea.sha }}" .
+          docker push "${IMAGE}:latest"
+          docker push "${IMAGE}:${{ gitea.sha }}"