From bbbc31c32cd7e9c9cd0c4061388d236247704f00 Mon Sep 17 00:00:00 2001
From: Teagan Glenn <that@teagantotally.rocks>
Date: Sat, 31 Jan 2026 06:40:25 -0700
Subject: [PATCH] Caching dev container

---
 .github/workflows/pull_request.yml | 54 ++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 14 deletions(-)

diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index c4d8aa7a0..4b6c4c545 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -10,6 +10,8 @@ on:
 
 env:
   DEFAULT_PYTHON: 3.11
+  REGISTRY: ghcr.io
+  DEV_IMAGE_NAME: ${{ github.repository }}-dev
 
 jobs:
   web_lint:
@@ -70,6 +72,27 @@ jobs:
         run: |
           ruff check frigate migrations docker *.py
 
+  devcontainer:
+    runs_on: ubuntu-latest
+    name: Build devcontainer
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Pre-build devcontainer image
+        uses: devcontainers/ci@v0.3
+        with:
+          imageName: ${{ env.REGISTRY }}/${{ env.DEV_IMAGE_NAME }}:latest
+          cacheFrom: ${{ env.REGISTRY }}/${{ env.DEV_IMAGE_NAME }}:latest
+          push: always
+
   python_tests:
     runs-on: ubuntu-latest
     name: Python Tests
@@ -78,18 +101,21 @@ jobs:
         uses: actions/checkout@v6
         with:
           persist-credentials: false
-      - uses: actions/setup-node@v6
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2 
         with:
-          node-version: 20.x
-      - name: Install devcontainer cli
-        run: npm install --global @devcontainers/cli
-      - name: Build devcontainer
-        env:
-          DOCKER_BUILDKIT: "1"
-        run: devcontainer build --workspace-folder .
-      - name: Start devcontainer
-        run: devcontainer up --workspace-folder .
-      - name: Run mypy in devcontainer
-        run: devcontainer exec --workspace-folder . bash -lc "python3 -u -m mypy --config-file frigate/mypy.ini frigate"
-      - name: Run unit tests in devcontainer
-        run: devcontainer exec --workspace-folder . bash -lc "python3 -u -m unittest"
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Pre-Run mypy in devcontainer
+        uses: devcontainers/ci@v0.3
+        with:
+          cacheFrom: ${{ env.REGISTRY }}/${{ env.DEV_IMAGE_NAME }}:latest
+          push: never
+          runCmd: python3 -u -m mypy --config-file frigate/mypy.ini frigate
+      - name: Pre-Run mypy in devcontainer
+        uses: devcontainers/ci@v0.3
+        with:
+          cacheFrom: ${{ env.REGISTRY }}/${{ env.DEV_IMAGE_NAME }}:latest
+          push: never
+          runCmd: python3 -u -m unittest