Convert to composite action and use cache dir (#55)

Switch to composite action so we can get rid of Javascript and install
cr to the cache location.

Signed-off-by: Reinhard Nägele <unguiculus@gmail.com>

README.md

@@ -15,7 +15,7 @@ A GitHub action to turn a GitHub project into a self-hosted Helm chart repo, usi
 
 For more information on inputs, see the [API Documentation](https://developer.github.com/v3/repos/releases/#input)
 
-- `version`: The chart-releaser version to use (default: v1.0.0)
+- `version`: The chart-releaser version to use (default: v1.1.1)
 - `config`: Optional config file for chart-releaser
 - `charts_dir`: The charts directory
 - `charts_repo_url`: The GitHub Pages URL to the charts repo (default: `https://<owner>.github.io/<project>`)
@@ -46,8 +46,13 @@ jobs:
           git config user.name "$GITHUB_ACTOR"
           git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
 
+      - name: Install Helm
+        uses: azure/setup-helm@v1
+        with:
+          version: v3.4.0
+
       - name: Run chart-releaser
-        uses: helm/chart-releaser-action@v1.0.0
+        uses: helm/chart-releaser-action@v1.1.1
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
 ```