Prepare for hacs

.github/workflows/build.yml

@@ -0,0 +1,14 @@
+name: Build
+on:
+    pull_request:
+    push:
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+            - name: Install
+              run: npm ci
+            - name: Build
+              run: npm run build

.github/workflows/release.yml

@@ -0,0 +1,22 @@
+name: Release
+on:
+    push:
+        tags:
+            - "v*.*.*"
+jobs:
+    release:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+            - name: Install
+              run: npm ci
+            - name: Build
+              run: npm run build
+            - name: Release
+              uses: softprops/action-gh-release@v1
+              if: startsWith(github.ref, 'refs/tags/')
+              with:
+                  draft: true
+                  generate_release_notes: true
+                  files: dist/*.js

.github/workflows/validate.yml

@@ -0,0 +1,15 @@
+name: HACS validation
+on:
+    push:
+        branches:
+            - main
+jobs:
+    validate:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+            - name: HACS validation
+              uses: "hacs/action@main"
+              with:
+                  category: "plugin"

hacs.json

@@ -0,0 +1,6 @@
+{
+    "name": "Energy Sankey Card",
+    "render_readme": true,
+    "filename": "energy-sankey.js",
+    "content_in_root": false
+}