Add "pgp-happy-eyeballs" in Travis to help cut down on gpg-related is…

…sues (currently unused, updated for completion)

See docker-library/php#666

.travis.yml

@@ -12,12 +12,18 @@ install:
 
 before_script:
   - env | sort
+  - wget -qO- 'https://github.com/tianon/pgp-happy-eyeballs/raw/master/hack-my-builds.sh' | bash
   - cd "$VERSION"
   - image="gcc:$VERSION"
 
 script:
-  - travis_retry docker build -t "$image" .
-  - ~/official-images/test/run.sh "$image"
+  - |
+    (
+      set -Eeuo pipefail
+      set -x
+      docker build -t "$image" .
+      ~/official-images/test/run.sh "$image"
+    )
 
 after_script:
   - docker images