Update buildspecs for PushToGitHub, ReleaseToMaven, PutFinalizeChangelogMsg

Author: davidh44

release-resources/buildspecs/push-to-github.yml

@@ -7,6 +7,7 @@ phases:
       java: "$JAVA_RUNTIME"
 
     commands:
+      - curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
       - apt-get update
       - pip install awscli --upgrade --user
       - pip install rsa

release-resources/buildspecs/put-finalize-changelog-message.yml

@@ -5,6 +5,7 @@ phases:
     runtime-versions:
       java: "$JAVA_RUNTIME"
     commands:
+      - curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
       - apt-get update
       - pip install awscli --upgrade --user
       - pip install rsa

release-resources/buildspecs/release-to-maven.yml

@@ -3,6 +3,7 @@ version: 0.2
 phases:
   install:
     commands:
+    - curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
     - apt-get update
     - apt-get install python3 python3-pip -y
     - update-alternatives --install /usr/bin/python python /usr/bin/python3 10