[ci] Add Bazel caching (#8006)

.github/actions/setup-build-buddy/action.yml

@@ -1,27 +0,0 @@
-name: 'Setup BuildBuddy acache'
-description: 'Sets up the build buddy cache to be readonly / writing based on the presence of environment variables'
-
-inputs:
-  token:
-    description: 'Build Buddy API token'
-
-runs:
-  using: "composite"
-  steps:
-    - name: Setup without key
-      env:
-        API_KEY: ${{ inputs.token }}
-      if: ${{ env.API_KEY == '' }}
-      shell: bash
-      run: |
-          echo "No API key secret detected, will setup readonly cache"
-          echo "build:ci --config=build_buddy_readonly" > bazel_auth.rc
-
-    - name: Set with key
-      env:
-        API_KEY: ${{ inputs.token }}
-      if: ${{ env.API_KEY != '' }}
-      shell: bash
-      run: |
-          echo "API Key detected!"
-          echo "build:build_buddy --remote_header=x-buildbuddy-api-key=${{ env.API_KEY }}" > bazel_auth.rc