Read decompressed metadata with ansible tasks

Using custom ansible module within zuul is not straightforward, using
ansible tasks to simplify things.

Change-Id: I90845a148c007657d2ce4faf191b1e46264432af

ansible.cfg

@@ -1,2 +0,0 @@
-[defaults]
-library = ./ansible_library

ansible_library/charm_metadata.py

@@ -1,48 +0,0 @@
-#!/usr/bin/env python3
-# Copyright 2024 Canonical Ltd.
-
-import pathlib
-import zipfile
-
-import yaml
-from ansible.module_utils.basic import AnsibleModule
-
-DOCUMENTATION = r"""
-module: charm_metadata
-author: Canonical
-description: Read charm metadata from a charm artifact
-
-options:
-  path:
-    description: path to charm artifact
-    required: yes
-"""
-
-EXAMPLES = r"""
-- name: Read charm metadata
-  charm_metadata:
-    charm: /tmp/keystone.charm
-"""
-
-
-def run_module():
-    module = AnsibleModule(
-        argument_spec=dict(
-            path=dict(type="str", required=True),
-        )
-    )
-
-    path: str = module.params["path"]  # type: ignore
-    charm_path = pathlib.Path(path)
-    if not charm_path.exists():
-        module.fail_json(msg=f"charm {path} not found on disk")
-
-    with zipfile.ZipFile(charm_path, "r") as charm_zip:
-        metadata = charm_zip.read("metadata.yaml")
-    metadata_dict = yaml.safe_load(metadata)
-
-    module.exit_json(changed=False, metadata=metadata_dict)
-
-
-if __name__ == "__main__":
-    run_module()

roles/charm-publish/tasks/publish.yaml

@@ -19,15 +19,24 @@
       include_role:
         name: ensure-docker
 
-    - name: Get metadata.yaml information
-      charm_metadata:
-        path: "{{ zuul.project.src_dir }}/{{ charm_build_name }}.charm"
-      register: charm_metadata
+    - name: Set project absolute path
+      set_fact:
+        project_abs: "{{ zuul.executor.work_root }}/{{ zuul.project.src_dir }}"
+
+    - name: Create charm destination folder
+      file:
+        path: "{{ project_abs }}/{{ charm_build_name }}"
+        state: directory
+
+    - name: Decompress charm
+      unarchive:
+        src: "{{ project_abs }}/{{ charm_build_name }}.charm"
+        dest: "{{ project_abs }}/{{ charm_build_name }}"
 
     - name: Upload oci-image to charmhub
       register: upload_oci_image_output
       vars:
-        metadata: "{{ charm_metadata['metadata'] }}"
+        metadata: "{{ lookup('file', project_abs + '/' + charm_build_name + '/metadata.yaml') | from_yaml }}"
       args:
         executable: /bin/bash
       shell: |