Add reusable docker-publish workflow

.forgejo/workflows/docker-publish.yml

@@ -0,0 +1,38 @@
+on:
+  workflow_call:
+    inputs:
+      image_name:
+        required: true
+        type: string
+        description: "Image name (e.g. aprs.me)"
+      registry:
+        required: false
+        type: string
+        default: "git.mcintire.me"
+        description: "Container registry hostname"
+      username:
+        required: false
+        type: string
+        default: "graham"
+    secrets:
+      FORGEJO_TOKEN:
+        required: true
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to Forgejo Registry
+        uses: graham/infra/.forgejo/actions/container-login@main
+        with:
+          registry: ${{ inputs.registry }}
+          username: ${{ inputs.username }}
+          token: ${{ secrets.FORGEJO_TOKEN }}
+
+      - name: Build and Push
+        run: |
+          TAG=${{ inputs.registry }}/${{ inputs.username }}/${{ inputs.image_name }}:latest
+          docker build -t $TAG .
+          docker push $TAG