Add HACS Action (hacs#354)

* Add HACS Action

* Rename

.github/workflows/validate.yaml

@@ -0,0 +1,30 @@
+name: "Validate with HACS"
+on:
+    pull_request:
+        branches:
+            - master
+
+jobs:
+    validate:
+        runs-on: ubuntu-latest
+        name: Validate
+        steps:
+            - name: Check out repository
+              uses: actions/checkout@v2
+
+            - name: Get file changes
+              id: get_file_changes
+              uses: dorner/[email protected]
+              with:
+                githubToken: ${{ secrets.GITHUB_TOKEN }}
+                plaintext: true
+
+            - name: export file changes
+              run: export CHANGED_FILES="${{ steps.get_file_changes.outputs.files }}"
+
+            - name: HACS validation
+              uses: "hacs/integration/action@master"
+              with:
+                GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              env:
+                CHANGED_FILES: "${{ steps.get_file_changes.outputs.files }}"