Update GitHub actions (#35)

* Create tests.yml

* Move copy of rootfs/ to top for github ssl cert load

* Include main branch, remove on push

* Remove old docker build test

* Update Dockerfile to include /CURRENT_VERSION

* Deploy to GitHub on push to main/master

* Fix typo

.github/workflows/tests.yml

@@ -0,0 +1,75 @@
+name: Tests
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+
+jobs:
+  buildx:
+    name: Test image build
+    runs-on: ubuntu-latest
+
+    # Set job-wide environment variables
+    #  - REPO: repo name on dockerhub
+    #  - IMAGE: image name on dockerhub
+    env:
+      REPO: mikenye
+      IMAGE: picard
+
+    strategy:
+      matrix:
+        docker-platform:
+          - linux/amd64
+         # - linux/arm64
+         # - linux/arm/v6
+         # - linux/arm/v7
+         # - linux/i386
+    steps:
+
+      # Check out our code
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+
+      # Hit an issue where arm builds would fail with cURL errors regarding intermediary certificates when downloading from github (ie: deploy-s6-overlay).
+      # After many hours of troubleshooting, the workaround is to pre-load the image's rootfs with the CA certificates from the runner.
+      # This problem may go away in future.
+      - 
+        name: Copy CA Certificates from GitHub Runner to Image rootfs
+        run: |
+          ls -la /etc/ssl/certs/
+          mkdir -p ./rootfs/etc/ssl/certs
+          mkdir -p ./rootfs/usr/share/ca-certificates/mozilla
+          cp --no-dereference /etc/ssl/certs/*.crt ./rootfs/etc/ssl/certs
+          cp --no-dereference /etc/ssl/certs/*.pem ./rootfs/etc/ssl/certs
+          cp --no-dereference /usr/share/ca-certificates/mozilla/*.crt ./rootfs/usr/share/ca-certificates/mozilla
+
+      # Set up QEMU for multi-arch builds
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      # Set up buildx for multi platform builds
+      -
+        name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      # Get archictecture suffix
+      -
+        name: Get image architecture suffix
+        run: |
+          echo "ARCH_TAG=$(echo '${{ matrix.docker-platform }}' | cut -d '/' -f2- | tr -s '/' '_')" >> $GITHUB_ENV
+      
+      # Show archictecture suffix
+      -
+        name: Show image architecture suffix
+        run: |
+          echo "Architecture suffix: ${{ env.ARCH_TAG }}"
+
+      # Test container build for all supported platforms (defined above)
+      - 
+        name: Build ${{ matrix.docker-platform }}
+        run: docker buildx build --no-cache --progress plain -t "${{ env.REPO }}/${{ env.IMAGE }}:testing_${{ env.ARCH_TAG }}" --platform "${{ matrix.docker-platform }}" .