ci: PLT-627: run tests weekly

Author: farioas

.github/workflows/tests.yml

@@ -18,6 +18,8 @@ on:
       - 'release/**'
     paths-ignore:
       - '**/*.md'  # Ignore changes to all .md files
+  schedule:
+    - cron: '0 6 * * 1'
 
 env:
   CACHE_NAME_PREFIX: v1
@@ -176,7 +178,7 @@ jobs:
             const docker_build_config = yaml.load(docker_build_config_content);
             
             let backends = [];
-            if (event_name === 'push') {
+            if (event_name === 'schedule') {
               const {data: examples} = await github.rest.repos.getContent({
                 owner: owner,
                 repo: repo,