Bump envoy when a new docker image is available

Fixes cloudfoundry/diego-release#504

pipelines/diego-pipeline.yml

@@ -39,7 +39,6 @@ groups:
   - github-release
   - merge-master-into-develop
   - validate-envoy-version
-  - update-envoy-blob
 - name: dusts
   jobs:
   - upgrade-routability-tests-from-v1.0.0
@@ -83,6 +82,7 @@ groups:
   - check-expired-bosh-certs
   - check-expired-test-fixture-certs
   - update-golang-packages
+  - update-envoy-blob
 - name: time-rotor
   jobs:
   - bbl-up-time-rotor-gcp
@@ -340,13 +340,10 @@ jobs:
   serial: true
   plan:
   - in_parallel:
-    - get: diego-release-master
-      passed: [merge-master-into-develop]
-      trigger: true
-      params:
-        submodules: none
     - get: diego-ci
     - get: diego-release
+    - get: envoyproxy-image
+      trigger: true
   - task: create-envoy-blob
     file: diego-ci/tasks/create_envoy_blob.build.yml
   - task: update-envoy-blob
@@ -1869,6 +1866,12 @@ resources:
     branch: bump-golang
     private_key: {{cf-diego-private-key}}
 
+- name: envoyproxy-image
+  type: docker-image
+  source:
+    repository: envoyproxy/envoy
+    tag: v1.14-latest
+
 - name: diego-release-envoy-bump
   type: git
   source:

tasks/create_envoy_blob.build.yml

@@ -11,7 +11,7 @@ image_resource:
   type: docker-image
   source:
     repository: envoyproxy/envoy
-    tag: v1.14.1
+    tag: v1.14-latest
 
 run:
   path: diego-ci/tasks/create_envoy_blob

tasks/update_envoy_blob

@@ -17,6 +17,12 @@ bosh sync-blobs
 old_envoy_version=$(ls -1 blobs/proxy/envoy*.tgz | xargs basename | sed 's/envoy-\(.*\).tgz/\1/g')
 new_envoy_version=$(../envoy-binary/envoy --version | grep -vE '^$' | awk '{print $3}' | cut -d/ -f1)
 
+if [[ "$old_envoy_version" == "$new_envoy_version" ]]; then
+  echo "$new_envoy_version is currently the latest version."
+  exit 0
+fi
+
+
 bosh remove-blob proxy/envoy-${old_envoy_version}.tgz
 bosh add-blob ../envoy-binary/envoy.tgz proxy/envoy-${new_envoy_version}.tgz
 sed -i "s/envoy.*\.tgz/envoy-${new_envoy_version}\.tgz/g" packages/proxy/*