Docker experiments

Try building the Zephyr samples in a Docker image.  Shouldn't be merged
until we figure out how to keep the docker image up to date.

Signed-off-by: David Brown <david.brown@linaro.org>
diff --git a/.github/workflows/happy.yaml b/.github/workflows/happy.yaml
new file mode 100644
index 0000000..98f93e9
--- /dev/null
+++ b/.github/workflows/happy.yaml
@@ -0,0 +1,25 @@
+# For development, trigger this on any push.
+on: push
+
+# Eventually, we'll want to limit this to pull requests.
+# on: ???
+
+jobs:
+  builder:
+    runs-on: ubuntu-latest
+    container:
+      image: d3zd3z/zephyr-build:20200813a
+      env:
+        HOME: /root
+
+    steps:
+    - name: Stuff
+      run: |
+        mount
+        env
+        pwd
+        id
+        ls /root/work
+        HOME=/root
+        /entrypoint.sh
+        # /entrypoint.sh