Fix more bash errors, and use better image (#9112)

Author: sigurdm

tool/build_image_proxy.yaml

@@ -27,17 +27,17 @@ steps:
       - 'PROJECT_ID=$PROJECT_ID'
       - 'BRANCH_NAME=$BRANCH_NAME'
       - 'TAG_NAME=$TAG_NAME'
-  - name: 'gcr.io/google-cloud-sdk'
+  - name: 'gcr.io/google.com/cloudsdktool/cloud-sdk'
     script: |
       #!/usr/bin/env bash
       set -x
       gcloud run deploy image-proxy-server \
         --image="us-central1-docker.pkg.dev/$PROJECT_ID/image-proxy/image-proxy:$TAG_NAME" \
         --region="us-central1" \
         --platform="managed" \
-        --quiet
-        --set-env-vars HMAC_KEY_ID='projects/$PROJECT_ID/locations/us-central1/keyRings/image-proxy-key-ring/cryptoKeys/image-proxy-mac-key/cryptoKeyVersions/1'
-        --service-account=image-proxy@$PROJECT_ID.iam.gserviceaccount.com
+        --quiet \
+        --set-env-vars HMAC_KEY_ID="projects/$PROJECT_ID/locations/us-central1/keyRings/image-proxy-key-ring/cryptoKeys/image-proxy-mac-key/cryptoKeyVersions/1" \
+        --service-account="image-proxy@$PROJECT_ID.iam.gserviceaccount.com"
     env:
       - 'PROJECT_ID=$PROJECT_ID'
       - 'TAG_NAME=$TAG_NAME'