Add --pages-branch parameter (#156)

Ref:
  helm/chart-releaser@378f527
  helm/chart-releaser@cb0563b

Signed-off-by: Michal Biesek <michalbiesek@gmail.com>

action.yml

@@ -35,6 +35,9 @@ inputs:
   packages_with_index:
     description: "Upload chart packages directly into publishing branch"
     required: false
+  pages_branch:
+    description: "Name of the branch to be used to push the index and artifacts. (default to: gh-pages but it is not set in the action it is a default value for the chart-releaser binary)"
+    required: false
 outputs:
   changed_charts:
     description: "A comma-separated list of charts that were released on this run. Will be an empty string if no updates were detected, will be unset if `--skip_packaging` is used: in the latter case your custom packaging step is responsible for setting its own outputs if you need them."
@@ -91,6 +94,10 @@ runs:
             args+=(--packages-with-index "${{ inputs.packages_with_index }}")
         fi
 
+        if [[ -n "${{ inputs.pages_branch }}" ]]; then
+            args+=(--pages-branch "${{ inputs.pages_branch }}")
+        fi
+
         "$GITHUB_ACTION_PATH/cr.sh" "${args[@]}"
 
         if [[ -f changed_charts.txt ]]; then