Weekly Cronjob fetching artifacts and generating polkadot.rs file. (#1352)

* github CI action cronjob

* add commit message

* fix the CI yml files

* binary crate for CI script with substrate-runner

* update the CI script

* correct the artifacts script

* remove bash script

Cargo.toml

@@ -12,6 +12,7 @@ members = [
     "metadata",
     "signer",
     "subxt",
+    "scripts/artifacts"
 ]
 
 # We exclude any crates that would depend on non mutually