Add Forgejo Actions CI to build & push the image

On push to main (and v* tags), builds the Docker image and pushes it to
the Forgejo container registry at git.plexultra.com/dlawler489/printhive
(:latest and :<short-sha>). Uses the auto-provided Actions token with
packages:write; plain docker CLI so it only needs the checkout action.
Compose image reference updated to the Forgejo registry.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.dockerignore

@@ -6,6 +6,7 @@ glb
 data
 .git
 .gitignore
+.forgejo
 .env
 *.log
 .DS_Store

.forgejo/workflows/build.yml

@@ -0,0 +1,28 @@
+name: build-and-push
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to the Forgejo container registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login git.plexultra.com -u "${{ github.actor }}" --password-stdin
+
+      - name: Build and push image
+        run: |
+          IMAGE="git.plexultra.com/${{ github.repository }}"
+          SHA="${{ github.sha }}"
+          docker build -t "$IMAGE:latest" -t "$IMAGE:${SHA:0:12}" .
+          docker push "$IMAGE:latest"
+          docker push "$IMAGE:${SHA:0:12}"

docker-compose.yml

@@ -16,7 +16,7 @@ services:
 
   app:
     build: .
-    image: ghcr.io/dlawler489/printhive:latest
+    image: git.plexultra.com/dlawler489/printhive:latest
     depends_on:
       db:
         condition: service_healthy