fix: pass service account directly to run step (GoogleCloudPlatform#4090)

* fix: rename service account env var

* export SERVICE_ACCOUNT on the run step

Author: David Cavazos

.github/workflows/custard-run-dev.yaml

@@ -109,6 +109,9 @@ jobs:
         run: |
           timeout ${{ fromJson(needs.affected.outputs.ci-setups)[matrix.path].timeout-minutes }}m \
             make test dir=${{ matrix.path }}
+        env:
+          # TODO: remove this when the self-contained runner lands.
+          SERVICE_ACCOUNT: [email protected]
       - name: Check success
         uses: GoogleCloudPlatform/cloud-samples-tools/actions/steps/update-check@9ee708234e240605d96e78f652c333ed6aa95a23 # v0.3.2
         with:

.github/workflows/custard-run.yaml

@@ -153,6 +153,9 @@ jobs:
         run: |
           timeout ${{ fromJson(needs.affected.outputs.ci-setups)[matrix.path].timeout-minutes }}m \
             make test dir=${{ matrix.path }}
+        env:
+          # TODO: remove this when the self-contained runner lands.
+          SERVICE_ACCOUNT: [email protected]
       - name: Check success
         uses: GoogleCloudPlatform/cloud-samples-tools/actions/steps/update-check@9ee708234e240605d96e78f652c333ed6aa95a23 # v0.3.2
         with: