Add build workflow

.dockerignore

@@ -1,3 +1,4 @@
+.forgejo/
 .DS_Store
 .idea
 *.log

.forgejo/workflows/build.yaml

@@ -0,0 +1,17 @@
+on:
+  push:
+    branches:
+      - main
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: docker/login-action@v3
+        with:
+          registry: git.phoenixinquis.net
+          username: ${{ github.actor }}
+          password: ${{ secrets.packaging_password }}
+      - uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: git.phoenixinquis.net/correlr/sharkey-prometheus-queues:latest