[ci] Run cronjob with app secrets (#1420)

* [ci] Run cronjob with app secrets

* rm github url

* move token creation closer to pr creation

* return checkout

* check that credentials work

* test gha

* add more test

* create test file

* rm tests

* add compression+decompression to avoid >100MB

* add shell field to action

* move zipped file to correct location

* strip binaries

---------

Co-authored-by: Tadeo hepperle <tadeo@do-mix.de>

.github/workflows/update-artifacts.yml

@@ -19,7 +19,6 @@ jobs:
     steps:
       - name: Checkout sources
         uses: actions/checkout@v4
-
       # We run this (up-to-date) node locally to fetch metadata from it for the artifacts
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -45,9 +44,16 @@ jobs:
       - name: Delete substrate node binary
         run: rm ./substrate-node
 
+      - uses: actions/create-github-app-token@v1
+        id: app-token
+        with:
+          app-id: ${{ secrets.SUBXT_PR_MAKER_APP_ID }}
+          private-key: ${{ secrets.SUBXT_PR_MAKER_APP_KEY }}
+
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v6
         with:
+          token: ${{ steps.app-token.outputs.token }}
           base: master
           branch: update-artifacts
           commit-message: Update Artifacts (auto-generated)