feat: add check action

action.yaml

@@ -0,0 +1,32 @@
+name: "check-latest-version-exists action"
+description: "Check whether the latest github release/tag of a pypi package exists on a registry. If not, return the latest version"
+
+inputs:
+  github-repository:
+    description: "The package's Github repository name (owner/repo)"
+    required: true
+  pypi-package:
+    description: "The name of the package"
+    required: true
+  pypi-base-url:
+    description: "The pypi registry URL"
+    required: true
+
+outputs:
+  version:
+    description: "The version of the package"
+    value: ${{ steps.check.outputs.version }}
+
+runs:
+  using: "composite"
+  steps:
+    - id: check
+      shell: bash
+      run: |
+        pip3 install requests
+        exec python3 $GITHUB_ACTION_PATH/check.py >> $GITHUB_OUTPUT 
+      env:
+        REPOSITORY: ${{ inputs.github-repository }}
+        PACKAGE: ${{ inputs.pypi-package}}
+        BASE_URL: ${{ inputs.pypi-base-url}}
+