feat: upload checked out code and download to use between workflows

Author: samrose

.github/workflows/nix-build.yml

@@ -31,6 +31,12 @@ jobs:
     runs-on: ${{ matrix.runner }}
     timeout-minutes: 180
     steps:
+      - name: Download repository
+        uses: actions/download-artifact@v4
+        with:
+          name: repository
+          path: .
+
       - name: aws-creds
         uses: aws-actions/configure-aws-credentials@v4
         with:

.github/workflows/shared-checkout.yml

@@ -7,6 +7,9 @@ on:
 jobs:
   checkout:
     runs-on: ubuntu-latest
+    outputs:
+      ref: ${{ github.event.pull_request.head.sha || github.sha }}
+      repository: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -15,4 +18,11 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
           fetch-depth: 0
           fetch-tags: true
-          token: ${{ secrets.GITHUB_TOKEN }} 
+          token: ${{ secrets.GITHUB_TOKEN }}
+      
+      - name: Upload repository
+        uses: actions/upload-artifact@v4
+        with:
+          name: repository
+          path: .
+          retention-days: 1