Move sbt override to cloud build

.github/cloud_builder/run_command_on_active_checkout.yaml

@@ -5,6 +5,11 @@ options:
 steps:
   - name: us-central1-docker.pkg.dev/external-snap-ci-github-gigl/gigl-base-images/gigl-builder:7d3182eeb6446ce3e35910babba990c8e003879d.109.1
     entrypoint: /bin/bash
+    # Route sbt through Google's Maven Central mirror to avoid 429 rate limits from repo1.maven.org.
+    # Intentionally set here (CI env) rather than in scala/.sbtopts or scala_spark35/.sbtopts to avoid
+    # affecting downstream consumers of GiGL (e.g. as a submodule) that have their own Maven routing.
+    env:
+      - 'SBT_OPTS=-Dsbt.override.build.repos=true -Dsbt.repository.config=repositories'
     args:
       - -c
       - |

.github/workflows/on-pr-comment.yml

@@ -172,6 +172,11 @@ jobs:
     steps:
     - name: Run Linting Tests
       uses: snapchat/gigl/.github/actions/run-command-on-pr@main
+      # Route sbt through Google's Maven Central mirror to avoid 429 rate limits from repo1.maven.org.
+      # Intentionally set here (CI env) rather than in scala/.sbtopts or scala_spark35/.sbtopts to avoid
+      # affecting downstream consumers of GiGL (e.g. as a submodule) that have their own Maven routing.
+      env:
+        SBT_OPTS: '-Dsbt.override.build.repos=true -Dsbt.repository.config=repositories'
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
         pr_number: ${{ github.event.issue.number }}

.github/workflows/on-pr-merge.yml

@@ -158,6 +158,11 @@ jobs:
           gcp_service_account_email: ${{ secrets.gcp_service_account_email }}
     - name: Run Lint Tests
       shell: bash
+      # Route sbt through Google's Maven Central mirror to avoid 429 rate limits from repo1.maven.org.
+      # Intentionally set here (CI env) rather than in scala/.sbtopts or scala_spark35/.sbtopts to avoid
+      # affecting downstream consumers of GiGL (e.g. as a submodule) that have their own Maven routing.
+      env:
+        SBT_OPTS: '-Dsbt.override.build.repos=true -Dsbt.repository.config=repositories'
       run: |
         # sourcing .profile is important to resolve paths for java, sbt, et al.
         # It is setup in the setup-python-tools action.