feat(docker): add multistage build for emulator and deployment

Author: thenav56

.github/workflows/docker-push-dev.yml

@@ -21,7 +21,7 @@ jobs:
           REPO_NAME: ghcr.io/${{ github.repository }}
         run: |
           REPO_NAME=$(echo $REPO_NAME | tr '[:upper:]' '[:lower:]')
-          TAG="0.3.2-dev"
+          TAG="0.3.3-dev"
 
           # Docker
           echo "docker_image_name=${REPO_NAME}" >> $GITHUB_OUTPUT
@@ -54,6 +54,7 @@ jobs:
         with:
           context: .
           builder: ${{ steps.buildx.outputs.name }}
+          target: emulator
           file: Dockerfile
           push: false
           load: true

Dockerfile

@@ -1,7 +1,7 @@
 # NOTE: If you make any BREAKING CHANGE:
 # - Update the Docker image tag in `./.github/workflows/docker-push-dev.yml`
 # - Update the `mapswipe-backend` workflow to use the new image tag
-FROM node:20-bullseye-slim
+FROM node:20-bullseye-slim AS base
 
 ENV PNPM_HOME="/pnpm"
 ENV PATH="$PNPM_HOME:$PATH"
@@ -18,9 +18,12 @@ WORKDIR /firebase
 ARG FIREBASE_TOOLS_VERSION=14.5.1
 
 RUN --mount=type=cache,target=/root/.npm \
-    npm install -g firebase-tools@$FIREBASE_TOOLS_VERSION \
-    # Download jar files
-    && firebase setup:emulators:database \
+    npm install -g firebase-tools@$FIREBASE_TOOLS_VERSION
+
+FROM base AS emulator
+
+# Pre-download firebase emulator tools
+RUN firebase setup:emulators:database \
     && firebase setup:emulators:firestore \
     && firebase setup:emulators:storage \
     && firebase setup:emulators:ui