From d7d855cd216b543668184b82c69e2a33b0aa8404 Mon Sep 17 00:00:00 2001
From: Simon Li <orpheus+devel@gmail.com>
Date: Tue, 8 Sep 2020 11:26:22 +0100
Subject: [PATCH 1/2] Add workflow to build Docker image

---
 .github/workflows/docker.yml | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 .github/workflows/docker.yml

diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
new file mode 100644
index 000000000..e08dfbb6e
--- /dev/null
+++ b/.github/workflows/docker.yml
@@ -0,0 +1,24 @@
+name: Docker build
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  docker:
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      # https://github.com/docker/build-push-action
+      - name: Build Docker image
+        uses: docker/build-push-action@v1
+        with:
+          repository: jupyter/repo2docker
+          push: false
+
+      - name: Run repo2docker Docker image
+        run: docker run jupyter/repo2docker repo2docker --version

From c32ce8677c2d62859c5a29f08ed2819e87353010 Mon Sep 17 00:00:00 2001
From: Simon Li <orpheus+devel@gmail.com>
Date: Tue, 8 Sep 2020 11:32:26 +0100
Subject: [PATCH 2/2] Docker workflow try adding tag

---
 .github/workflows/docker.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index e08dfbb6e..79f862fa9 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -18,7 +18,8 @@ jobs:
         uses: docker/build-push-action@v1
         with:
           repository: jupyter/repo2docker
+          tags: pr
           push: false
 
       - name: Run repo2docker Docker image
-        run: docker run jupyter/repo2docker repo2docker --version
+        run: docker run jupyter/repo2docker:pr repo2docker --version