feat: initial

action.yml

@@ -0,0 +1,28 @@
+name: "Check conventional commit message"
+description: "Checks if a value follows the conventional commit message specification."
+inputs:
+  value:
+    description: "The value to test."
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: Check conventional commit message
+      shell: bash
+      env:
+        INPUT_VALUE: ${{ inputs.value }}
+      run: |
+        set -eo pipefail
+
+        CONVENTIONAL_COMMIT_REGEX='^(build|chore|ci|docs|feat|fix|perf|refactor|revert|style|test)(\([[:alnum:]._-]+\))?(!)?: .+'
+
+        printf 'Checking "%s"...\n' "$INPUT_VALUE"
+
+        if ! printf '%s\n' "$INPUT_VALUE" | grep -qE "$CONVENTIONAL_COMMIT_REGEX"; then
+          echo "::error title=Invalid Commit Message::Input '$INPUT_VALUE' is not a valid conventional commit message."
+          echo "Please refer to the specification: https://www.conventionalcommits.org/en/v1.0.0/"
+          exit 1
+        else
+          echo "::notice::Input is valid :)"
+        fi