add submodule and workflow

.forgejo/workflows/build.yaml

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+name: Build And Publish Docker
+
+on:
+  push:
+    branches:
+      - "master"
+jobs:
+  build:
+    runs-on: debian-bookworm
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: 'true'
+      - name: Install deps
+        run: curl -fsSL https://get.docker.com -o get-docker.sh && sh get-docker.sh
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@master
+
+      - name: Login to Self-Hosted Registry
+        uses: docker/login-action@v2
+        with:
+          registry: codeberg.org
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+
+      - name: Build and Push Extended Version
+        uses: docker/build-push-action@v4
+        with:
+          builder: ${{ steps.buildx.outputs.name }}
+          context: ./valhalla-app
+          file: ./valhalla-app/Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: |
+            "git.myco.systems/brooke/valhalla-app-container:latest"          

.gitmodules

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+[submodule "vallhalla-app"]
+	path = vallhalla-app
+	url = https://github.com/gis-ops/valhalla-app.git

vallhalla-app

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+Subproject commit b6266482c547aa678a4ec8a2452ff861bd2c76f2