feat: add a "match_tags" option

I use this action to release the chart of [Mercure](https://mercure.rocks).
We use a monolithic Git repository containing several projects, including the Helm chart.
Currently, this action isn't compatible with our setup because it computes the changes
made to the chart since the previous tag.

In our case we also use tags for other projects in the same repository,
so this actions is never triggered because there is no changes with the "previous" tag (which usually is for another project in the same repository).

This PR introduces a `match_tags` option allowing to filter the tags to match using a glob.

README.md

@@ -19,6 +19,7 @@ For more information on inputs, see the [API Documentation](https://developer.gi
 - `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>`)
+- `match_tags`: The glob to use to filter Git tags, usually used with the `CR_RELEASE_NAME_TEMPLATE` environment variable (default: all tags)
 
 ### Example Workflow
 

action.yml

@@ -7,13 +7,20 @@ branding:
 inputs:
   version:
     description: "The chart-releaser version to use (default: v1.2.1)"
+    required: false
   config:
     description: "The relative path to the chart-releaser config file"
+    required: false
   charts_dir:
     description: The charts directory
     default: charts
+    required: false
   charts_repo_url:
     description: "The GitHub Pages URL to the charts repo (default: https://<owner>.github.io/<repo>)"
+    required: false
+  match_tags:
+    description: "The glob to use to filter Git tags (default: all tags)"
+    required: false
 runs:
   using: composite
   steps:
@@ -36,5 +43,9 @@ runs:
             args+=(--charts-repo-url "${{ inputs.charts_repo_url }}")
         fi
 
+        if [[ -n "${{ inputs.match_tags }}" ]]; then
+            args+=(--match-tags "${{ inputs.match_tags }}")
+        fi
+
         "$GITHUB_ACTION_PATH/cr.sh" "${args[@]}"
       shell: bash

cr.sh

@@ -31,6 +31,7 @@ Usage: $(basename "$0") <options>
     -u, --charts-repo-url    The GitHub Pages URL to the charts repo (default: https://<owner>.github.io/<repo>)
     -o, --owner              The repo owner
     -r, --repo               The repo name
+    -m, --match-tags         The glob to use to filter Git tags (default: all tags)
 EOF
 }
 
@@ -41,6 +42,7 @@ main() {
     local owner=
     local repo=
     local charts_repo_url=
+    local match_tags=
 
     parse_command_line "$@"
 
@@ -151,6 +153,16 @@ parse_command_line() {
                     exit 1
                 fi
                 ;;
+            -m|--match-tags)
+                if [[ -n "${2:-}" ]]; then
+                    match_tags="$2"
+                    shift
+                else
+                    echo "ERROR: '--match-tags' cannot be empty." >&2
+                    show_help
+                    exit 1
+                fi
+                ;;
             *)
                 break
                 ;;
@@ -202,7 +214,12 @@ install_chart_releaser() {
 lookup_latest_tag() {
     git fetch --tags > /dev/null 2>&1
 
-    if ! git describe --tags --abbrev=0 2> /dev/null; then
+    args=("describe" "--tags" "--abbrev=0")
+    if [ -n "$match_tags" ]; then
+        args+=(--match="$match_tags")
+    fi
+
+    if ! git "${args[@]}" 2> /dev/null; then
         git rev-list --max-parents=0 --first-parent HEAD
     fi
 }