Release notes script also looks at DB migrations

- Concourse used to do this for us, but because of no longer having CCNG
submoduled into this repo, easiest thing to do was to move the logic of
determining what new migrations were added into this release notes
script here

[#173368867]

Co-authored-by: Piyali Banerjee <pbanerjee@pivotal.io>
Co-authored-by: Jaskanwal Pawar <jpawar@pivotal.io>

Author: piyalibanerjee

scripts/generate_release_notes.sh

@@ -24,12 +24,17 @@ pushd "${HOME}/workspace/git_repo_changelog" > /dev/null
 
   pushd "${HOME}/workspace/capi-k8s-release" > /dev/null
     git checkout ${OLD_VERSION} 2>/dev/null
-    old_ccng_image_digest="$(bosh int --path=/images/ccng values/images.yml)"
-    old_ccng_sha="$(git log --grep="${old_ccng_image_digest}" | rg "cloud_controller_ng" -A1 | tail -n+2)"
+    OLD_CCNG_IMAGE_DIGEST="$(bosh int --path=/images/ccng values/images.yml)"
+    OLD_CCNG_SHA="$(git log --grep="${OLD_CCNG_IMAGE_DIGEST}" | rg "cloud_controller_ng" -A1 | tail -n+2)"
 
     git checkout ${NEW_VERSION} 2>/dev/null
-    new_ccng_image_digest="$(bosh int --path=/images/ccng values/images.yml)"
-    new_ccng_sha="$(git log --grep="${new_ccng_image_digest}" | rg "cloud_controller_ng" -A1 | tail -n+2)"
+    NEW_CCNG_IMAGE_DIGEST="$(bosh int --path=/images/ccng values/images.yml)"
+    NEW_CCNG_SHA="$(git log --grep="${NEW_CCNG_IMAGE_DIGEST}" | rg "cloud_controller_ng" -A1 | tail -n+2)"
+  popd > /dev/null
+
+  pushd "${HOME}/workspace/capi-release/src/cloud_controller_ng" > /dev/null
+    git checkout ${NEW_CCNG_SHA} 2>/dev/null
+    MIGRATIONS=($(git diff --diff-filter=A --name-only $OLD_CCNG_SHA db/migrations))
   popd > /dev/null
 
   echo ""
@@ -38,6 +43,19 @@ pushd "${HOME}/workspace/git_repo_changelog" > /dev/null
   # NOTE: if you're not authorized properly, this could mask that (i.e. gave a valid tracker token
   # but don't have permissions on our project)
   bundle exec rake \
-    "changelog[${HOME}/workspace/capi-release/src/cloud_controller_ng,${old_ccng_sha},${new_ccng_sha},]" \
+    "changelog[${HOME}/workspace/capi-release/src/cloud_controller_ng,${OLD_CCNG_SHA},${NEW_CCNG_SHA},]" \
     2>/dev/null | tail -n+2 | sort | uniq | rg -v "failed to fetch story title"
+
+  echo ""
+  echo "🚀 Generating database migrations list for cloud_controller_ng... 🚀" 1>&2
+  MIGRATIONS_FORMATTED=()
+  if [ ${#MIGRATIONS[@]} -eq '0' ]; then
+    MIGRATIONS_FORMATTED+=("None")
+  else
+    for i in "${MIGRATIONS[@]}"
+    do
+      MIGRATIONS_FORMATTED+=("- [$(basename $i)](https://github.com/cloudfoundry/cloud_controller_ng/blob/$NEW_CCNG_SHA/$i)")
+    done
+  fi
+  echo "${MIGRATIONS_FORMATTED[*]}"
 popd > /dev/null