Use env vars for tag prefix option in action

Author: davegaeddert

action.yml

@@ -15,8 +15,8 @@ runs:
   using: docker
   image: Dockerfile
   args:
-    - >
-      --changelog ${{ inputs.changelog }}
-      ${{ inputs.tag_prefix ? "--tag-prefix " + inputs.tag_prefix : "--no-tag-prefix" }}
+    - --changelog ${{ inputs.changelog }}
   env:
+    CR_TAG_PREFIX: ${{ inputs.tag_prefix }}
+    CR_NO_TAG_PREFIX: ${{ inputs.tag_prefix == "" }}
     GITHUB_TOKEN: ${{ inputs.github_token }}

changerelease/cli.py

@@ -21,8 +21,8 @@ def cli():
     type=click.Path(exists=True, file_okay=True, dir_okay=False),
     show_default=True,
 )
-@click.option("--tag-prefix", default="v", show_default=True)
-@click.option("--no-tag-prefix", default=False, is_flag=True)
+@click.option("--tag-prefix", default="v", show_default=True, envvar="CR_TAG_PREFIX")
+@click.option("--no-tag-prefix", default=False, is_flag=True, envvar="CR_NO_TAG_PREFIX")
 @click.option("--repo", envvar="GITHUB_REPOSITORY", required=True)
 @click.option(
     "--api-url",