Better devcontainers

Author: trask

.devcontainer/Dockerfile

@@ -0,0 +1,40 @@
+# Use the same base image as the original devcontainer
+FROM mcr.microsoft.com/vscode/devcontainers/base:bullseye
+
+# Install Microsoft OpenJDK 17
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends \
+        wget \
+        ca-certificates \
+    && wget -q https://packages.microsoft.com/config/debian/11/packages-microsoft-prod.deb -O packages-microsoft-prod.deb \
+    && dpkg -i packages-microsoft-prod.deb \
+    && rm packages-microsoft-prod.deb \
+    && apt-get update \
+    && apt-get -y install --no-install-recommends \
+        msopenjdk-17 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set JAVA_HOME for Microsoft OpenJDK
+ENV JAVA_HOME=/usr/lib/jvm/msopenjdk-17-amd64
+ENV PATH="$JAVA_HOME/bin:$PATH"
+
+# Switch to vscode user for the build
+USER vscode
+
+# Set working directory for build
+WORKDIR /tmp/build
+
+# Copy all project files for the build
+COPY --chown=vscode:vscode . ./
+
+# Pre-populate Gradle cache by running assemble
+# Use --no-daemon to avoid leaving daemon processes running
+# Skip javadoc to speed up the build and avoid external dependency issues
+RUN ./gradlew assemble -x javadoc --no-daemon
+
+# Clean up the build directory but preserve gradle cache
+RUN rm -rf /tmp/build
+
+# Set default working directory for development
+WORKDIR /workspaces

.devcontainer/devcontainer.json

@@ -1,10 +1,7 @@
 {
   "name": "Application Insights Java Development Environment",
-  "image": "mcr.microsoft.com/vscode/devcontainers/base:bullseye",
+  "image": "ghcr.io/microsoft/applicationinsights-java/devcontainer:latest",
   "features": {
-    "ghcr.io/devcontainers/features/java:1": {
-      "version": "17"
-    },
     "ghcr.io/devcontainers/features/docker-in-docker:2": {
       "version": "latest"
     }
@@ -17,10 +14,5 @@
         "ms-vscode.vscode-json"
       ]
     }
-  },
-  "mounts": [
-    "source=gradle-cache,target=/home/vscode/.gradle,type=volume"
-  ],
-  "remoteUser": "vscode",
-  "postCreateCommand": "sudo chown -R vscode:vscode /home/vscode/.gradle"
+  }
 }

.github/workflows/build-devcontainer.yml

@@ -0,0 +1,55 @@
+name: Build Devcontainer Image
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+    inputs:
+      force_rebuild:
+        description: 'Force rebuild without cache'
+        type: boolean
+        default: false
+
+jobs:
+  build-and-push-devcontainer:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}/devcontainer
+          tags: |
+            type=ref,event=branch
+            type=sha
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: .devcontainer/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          cache-from: ${{ github.event.inputs.force_rebuild != 'true' && 'type=gha' || '' }}
+          cache-to: type=gha,mode=max