Add CDN cache invalidation to deploy scripts.

operations/invalidate-cdn-cache.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+echo "Looking up CloudFront distribution ID for Personal Measure ${TARGET_ENV} environment."
+cloudfront_distribution_id=$(\
+  aws cloudfront list-distributions \
+    --query "DistributionList.Items[?starts_with(Comment, 'Personal Measure ${TARGET_ENV}')].Id | [0]" \
+  | sed -e 's/^"//' -e 's/"$//'
+)
+
+if [[ -z "${cloudfront_distribution_id}" ]]; then
+  >&2 echo "Unable to find CloudFront distribution for domain ${TARGET_ENV}."
+  exit 3
+fi
+
+echo "Found distribution ID ${cloudfront_distribution_id}."
+
+echo "Invalidating the CloudFront cache for ${TARGET_ENV}."
+invalidation_id=$(aws cloudfront create-invalidation \
+  --query 'Invalidation.Id' \
+  --distribution-id "${cloudfront_distribution_id}" \
+  --paths '/index.html')
+
+if [[ $? -ne 0 || -z "${invalidation_id}" ]]; then
+  >&2 echo "Unable to create the CloudFront invalidation."
+else
+  echo "Successfully created invalidation ${invalidation_id}."
+fi
+
+echo "Done."