Use remote config for travis builds when possible (#241)

* use remote config

* fix bash


Former-commit-id: 2a7b342baea6168970088d547313d7517ec0d6d9 [formerly d1adf6e65b1bb505eea12cf65499a72713621ca2]
Former-commit-id: e0dba82a206e174178373561d497152e47300aaf

.travis-bazelrc

@@ -5,8 +5,8 @@ startup --host_jvm_args=-Xmx500m --host_jvm_args=-Xms500m
 build --spawn_strategy=standalone --genrule_strategy=standalone
 
 # Remote caching over Google Cloud Storage
-#build --remote_http_cache=https://storage.googleapis.com/prysmatic-bazel-cache 
-#build --google_credentials=/tmp/service-account.json
+build:remote --remote_http_cache=https://storage.googleapis.com/prysmatic-bazel-cache
+build:remote --google_credentials=/tmp/service-account.json
 
 # Set some build options for travis container.
 build --local_resources=1536,1.5,0.5

.travis.yml

@@ -42,8 +42,11 @@ matrix:
           ./install.sh --user
           rm -f install.sh
         # Decrypt service account (only works on prysmaticlabs branches)
-        - if [[ $encrypted_64ca747eb448_iv ]]; then openssl aes-256-cbc -K $encrypted_64ca747eb448_key -iv $encrypted_64ca747eb448_iv
-          -in service-account.json.enc -out /tmp/service-account.json -d; fi
+        - if [[ $encrypted_64ca747eb448_iv ]]; then
+            openssl aes-256-cbc -K $encrypted_64ca747eb448_key -iv $encrypted_64ca747eb448_iv
+            -in service-account.json.enc -out /tmp/service-account.json -d;
+            REMOTE_FLAGS=--config=remote;
+          fi
       
       install: true # Skip install go packages.
           
@@ -53,7 +56,7 @@ matrix:
           bazel \
             --bazelrc=.travis-bazelrc \
             test \
-            //...
+            //... $REMOTE_FLAGS
         
         # Check that BUILD files are formatted  correctly.
         - ./check_gazelle.sh