Add chart releaser action (#3)

* Add chartmuseum-auth chart

* Add chart releaser action

.github/workflows/release.yaml

@@ -0,0 +1,37 @@
+name: Release Charts
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Fetch history
+        run: git fetch --prune --unshallow
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      # See https://github.com/helm/chart-releaser-action/issues/6
+      - name: Install Helm
+        run: |
+          curl -fsSLo get_helm.sh https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3
+          chmod 700 get_helm.sh
+          ./get_helm.sh
+
+      - name: Add dependency chart repos
+        run: |
+          helm repo add stable https://charts.helm.sh/stable
+
+      - name: Run chart-releaser
+        uses: helm/chart-releaser-action@v1.0.0
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"