Add action to build and push docker image on master update

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
   build-deb:
     runs-on: ubuntu-20.04
     container:
-      image: debian:testing
+      image: debian:stable
     steps:
       - name: Installing Dependencies
         run: |

.github/workflows/docker_image.yml

@@ -0,0 +1,28 @@
+name: build_image
+
+on:
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: ixsystems/zfs:latest
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

Dockerfile

@@ -0,0 +1,21 @@
+FROM debian:stable-slim
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update
+
+RUN apt-get install -y \
+      debhelper-compat \
+      devscripts
+
+ENV WORK_DIR /zfs_app/zfs
+WORKDIR ${WORK_DIR}
+
+ADD . ${WORK_DIR}/
+
+RUN cp -a contrib/truenas debian
+RUN mk-build-deps --build-dep
+RUN apt install -y ./*.deb
+RUN dch -b -M --force-distribution --distribution bullseye-truenas-unstable "Tagged from ixsystems/zfs CI"
+RUN debuild -us -uc -b
+RUN apt-get install -y ../*.deb