Add initial build script

.github/workflows/build.yml

@@ -0,0 +1,116 @@
+---
+# yamllint disable rule:line-length rule:truthy
+name: Build add-on
+
+env:
+  BUILD_ARGS: "--test"
+  MONITORED_FILES: "apparmor.txt build.yaml config.yaml Dockerfile rootfs"
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  init:
+    runs-on: ubuntu-latest
+    name: Initialize builds
+    outputs:
+      changed_addons: ${{ steps.changed_addons.outputs.addons }}
+      changed: ${{ steps.changed_addons.outputs.changed }}
+    steps:
+      - name: Check out the repository
+        uses: actions/checkout@v3.3.0
+
+      - name: Get changed files
+        id: changed_files
+        uses: jitterbit/get-changed-files@v1
+
+      - name: Find add-on directories
+        id: addons
+        uses: home-assistant/actions/helpers/find-addons@master
+
+      - name: Get changed add-ons
+        id: changed_addons
+        run: |
+          declare -a changed_addons
+          for addon in ${{ steps.addons.outputs.addons }}; do
+            if [[ "${{ steps.changed_files.outputs.all }}" =~ $addon ]]; then
+              for file in ${{ env.MONITORED_FILES }}; do
+                  if [[ "${{ steps.changed_files.outputs.all }}" =~ $addon/$file ]]; then
+                    if [[ ! "${changed_addons[@]}" =~ $addon ]]; then
+                      changed_addons+=("\"${addon}\",");
+                    fi
+                  fi
+              done
+            fi
+          done
+
+          changed=$(echo ${changed_addons[@]} | rev | cut -c 2- | rev)
+
+          if [[ -n ${changed} ]]; then
+            echo "Changed add-ons: $changed";
+            echo "changed=true" >> "$GITHUB_OUTPUT";
+            echo "addons=[$changed]" >> "$GITHUB_OUTPUT";
+          else
+            echo "No add-on had any monitored files changed (${{ env.MONITORED_FILES }})";
+          fi
+
+  build:
+    needs: init
+    runs-on: ubuntu-latest
+    if: needs.init.outputs.changed == 'true'
+    name: Build ${{ matrix.arch }} ${{ matrix.addon }} add-on
+    strategy:
+      matrix:
+        addon: ${{ fromJson(needs.init.outputs.changed_addons) }}
+        arch: ["aarch64", "amd64", "armhf", "armv7", "i386"]
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v3.3.0
+
+      - name: Get information
+        id: info
+        uses: home-assistant/actions/helpers/info@master
+        with:
+          path: "./${{ matrix.addon }}"
+
+      - name: Check if add-on should be built
+        id: check
+        run: |
+          if [[ "${{ steps.info.outputs.architectures }}" =~ ${{ matrix.arch }} ]]; then
+             echo "build_arch=true" >> "$GITHUB_OUTPUT";
+           else
+             echo "${{ matrix.arch }} is not a valid arch for ${{ matrix.addon }}, skipping build";
+          fi
+
+      - name: Set build arguments
+        if: steps.check.outputs.build_arch == 'true'
+        run: |
+          if [[ -z "${{ github.head_ref }}" ]] && [[ "${{ github.event_name }}" == "push" ]]; then
+              echo "BUILD_ARGS=--docker-hub-check" >> $GITHUB_ENV;
+          fi
+
+      - name: Login to GitHub Container Registry
+        if: env.BUILD_ARGS != '--test'
+        uses: docker/login-action@v2.1.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build ${{ matrix.addon }} add-on
+        if: steps.check.outputs.build_arch == 'true'
+        uses: home-assistant/builder@2022.11.0
+        with:
+          args: |
+            ${{ env.BUILD_ARGS }} \
+            --${{ matrix.arch }} \
+            --target /data/${{ matrix.addon }} \
+            --image "${{ steps.check.outputs.image }}" \
+            --docker-hub "ghcr.io/${{ github.repository_owner }}" \
+            --addon