add script to flip the prod bluegreen defelctor service

.cloudbuild/bluegreen-flip.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# Ensure that our cloudbuild has everything we need
+for cmd in git yq; do
+    if ! command -v $cmd &> /dev/null; then
+        echo "Error: $cmd is not installed." >&2
+        exit 1
+    fi
+done
+
+
+mkdir -p /root/.ssh && chmod 0700 /root/.ssh
+echo "$DEPLOY_KEY" > /root/.ssh/id_rsa
+chmod 400 /root/.ssh/id_rsa
+ssh-keyscan -t rsa github.com > /root/.ssh/known_hosts
+git clone git@github.com:broadinstitute/gnomad-deployments.git
+
+cd gnomad-deployments/browser-test/prod-deflector
+
+CURRENT_DEPLOYMENT=$(yq '.spec.selector.deployment' < gnomad-bluegreen.service.yaml)
+
+echo "Current deployment is: $CURRENT_DEPLOYMENT"
+
+if [[ "$CURRENT_DEPLOYMENT" != "blue" && "$CURRENT_DEPLOYMENT" != "green" ]]; then
+    echo "Error: Current deployment is not either green or blue, unknown state. Exiting."
+    exit 1
+fi
+
+if [[ "$CURRENT_DEPLOYMENT" == "blue" ]]; then
+    TARGET_DEPLOYMENT="green"
+else
+    TARGET_DEPLOYMENT="blue"
+fi
+
+yq -i ".spec.selector.deployment = \"${TARGET_DEPLOYMENT}\"" gnomad-bluegreen.service.yaml
+
+git add gnomad-bluegreen.service.yaml
+git -c user.name="TGG Automation" -c user.email="tgg-automation@broadinstitute.org" commit -m "Updating gnomad-browser active service to $TARGET_DEPLOYMENT"
+git show
+
+git push origin main

.cloudbuild/flip-browser-bluegreen.yaml

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+steps:
+  - name: 'us-central1-docker.pkg.dev/${PROJECT_ID}/tgg-sre-images/tgg-deploykit:testing-4'
+    entrypoint: 'bash'
+    args: ['./bluegreen-flip.sh']
+    dir: '.cloudbuild'
+    secretEnv:
+      - 'DEPLOY_KEY'
+availableSecrets:
+  secretManager:
+    - versionName: projects/$PROJECT_ID/secrets/GITHUB_DEPLOY_KEY/versions/latest
+      env: 'DEPLOY_KEY'