Add dogfood image (#3350)

.github/workflows/dogfood.yaml

@@ -0,0 +1,43 @@
+name: dogfood
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "*"
+    paths:
+      - "dogfood/**"
+  pull_request:
+    paths:
+      - "dogfood/**"
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get branch name
+        id: branch-name
+        uses: tj-actions/branch-names@v5.4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: "{{defaultContext}}:dogfood"
+          push: true
+          tags: "codercom/oss-dogfood:${{ steps.branch-name.outputs.current_branch }},codercom/oss-dogfood:latest"
+          cache-from: type=registry,ref=codercom/oss-dogfood:latest
+          cache-to: type=inline