ci: make blacksmith usage internal only

.github/workflows/daedalus-docker.yml

@@ -31,11 +31,25 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       skip: ${{ steps.check.outputs.skip }}
+      internal: ${{ steps.check-internal.outputs.internal }}
     if: ${{ always() }}
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
+      - name: Check if workflow runs on an internal branch
+        id: check-internal
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
+          REPO: ${{ github.repository }}
+        run: |
+          if [ "$EVENT_NAME" != "pull_request" ] || [ "$HEAD_REPO" = "$REPO" ]; then
+            echo "internal=true" >> $GITHUB_OUTPUT
+          else
+            echo "internal=false" >> $GITHUB_OUTPUT
+          fi
+
       - name: Merge Queue CI Check Skipper
         id: merge-queue-ci-skipper
         uses: ./.github/merge-queue-ci-skipper
@@ -58,18 +72,18 @@ jobs:
           fi
 
   docker:
-    runs-on: blacksmith-4vcpu-ubuntu-2404
+    runs-on: ${{ needs.skip-if-clean.outputs.internal == 'true' && 'blacksmith-4vcpu-ubuntu-2404' || 'ubuntu-latest' }}
     env:
-      SCCACHE_DIR: '/mnt/sccache'
-      SCCACHE_CACHE_SIZE: '10G'
-      SCCACHE_MULTILEVEL_CHAIN: 'disk,s3'
-      SCCACHE_S3_KEY_PREFIX: '${{ github.repository }}/'
+      SCCACHE_DIR: ${{ needs.skip-if-clean.outputs.internal == 'true' && '/mnt/sccache' || '' }}
+      SCCACHE_CACHE_SIZE: ${{ needs.skip-if-clean.outputs.internal == 'true' && '10G' || '' }}
+      SCCACHE_MULTILEVEL_CHAIN: ${{ needs.skip-if-clean.outputs.internal == 'true' && 'disk,s3' || '' }}
+      SCCACHE_S3_KEY_PREFIX: ${{ needs.skip-if-clean.outputs.internal == 'true' && format('{0}/', github.repository) || '' }}
       SCCACHE_BUCKET: ${{ secrets.SCCACHE_BUCKET }}
       SCCACHE_REGION: ${{ secrets.SCCACHE_REGION }}
       SCCACHE_ENDPOINT: ${{ secrets.SCCACHE_ENDPOINT }}
       AWS_ACCESS_KEY_ID: ${{ secrets.SCCACHE_S3_ACCESS_KEY_ID }}
       AWS_SECRET_ACCESS_KEY: ${{ secrets.SCCACHE_S3_SECRET_ACCESS_KEY }}
-      RUSTC_WRAPPER: 'sccache'
+      RUSTC_WRAPPER: ${{ needs.skip-if-clean.outputs.internal == 'true' && 'sccache' || '' }}
     needs: [skip-if-clean]
     if: ${{ needs.skip-if-clean.outputs.skip != 'true' }}
     steps:
@@ -92,12 +106,14 @@ jobs:
           key: ${{ runner.os }}-${{ runner.arch }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Mount sccache disk cache
+        if: needs.skip-if-clean.outputs.internal == 'true'
         uses: useblacksmith/stickydisk@13af8883542ca949a717e70fef89d15edbb29d88 # v1.2.0
         with:
           key: ${{ github.repository }}-daedalus-sccache
           path: /mnt/sccache
 
       - name: Setup sccache
+        if: needs.skip-if-clean.outputs.internal == 'true'
         uses: mozilla-actions/sccache-action@9e7fa8a12102821edf02ca5dbea1acd0f89a2696 # v0.0.10
 
       - name: Build daedalus_client