feat(ci): wrap fragile commands with travis_retry

travis_retry allows to retry a command a few times if it fails, use it for all commands that depend on external resources which could fail, so that we reduce noise caused by temporary issues with docker hub or npm/yarn registry

.travis.yml

@@ -25,7 +25,7 @@ jobs:
         - make mock-assets
       script: make test-go
       after_success:
-        - bash <(curl -s https://codecov.io/bash) -F backend
+        - travis_retry bash <(curl -s https://codecov.io/bash) -F backend
 
     - stage: Test
       <<: *DEFAULTS_JS
@@ -34,7 +34,7 @@ jobs:
         - NODE_ENV=test
       script: make test-js
       after_success:
-        - bash <(curl -s https://codecov.io/bash) -F ui -s ui
+        - travis_retry bash <(curl -s https://codecov.io/bash) -F ui -s ui
 
     # duplicate js test but with a different time zone, to ensure that tests/code work with non-UTC time zone
     - stage: Test
@@ -45,7 +45,7 @@ jobs:
         - TZ=Pacific/Easter
       script: make test-js
       after_success:
-        - bash <(curl -s https://codecov.io/bash) -F ui -s ui
+        - travis_retry bash <(curl -s https://codecov.io/bash) -F ui -s ui
 
     - stage: Lint
       <<: *DEFAULTS_JS
@@ -61,7 +61,7 @@ jobs:
       before_script:
         - make mock-assets
         # https://github.com/golang/go/issues/26794
-        - go mod download
+        - travis_retry go mod download
       script: make lint-go
 
     - stage: Lint
@@ -83,7 +83,7 @@ jobs:
         - GO111MODULE=on
       script:
         - make mock-assets
-        - go get -d -v
+        - travis_retry go get -d -v
         - git diff --exit-code
 
     - stage: Build Docker image
@@ -103,14 +103,14 @@ jobs:
       before_script:
         # this stage needs to build everything including assets file and that
         # requires running webpack, so we need nodejs here
-        - nvm install $(< .nvmrc)
+        - travis_retry nvm install $(< .nvmrc)
       script:
         # https://github.com/golang/go/issues/26794
-        - go mod download
+        - travis_retry go mod download
         # compile assets via webpack and build those into bindata_assetfs.go file
         - make bindata_assetfs.go
         # and now compile using bakelite for all target archs
-        - go install github.com/terinjokes/bakelite
+        - travis_retry go install github.com/terinjokes/bakelite
         - export SOURCE_DATE_EPOCH=$(git show -s --format=%ci ${TRAVIS_TAG:-${TRAVIS_COMMIT}}^{commit})
         - bakelite -platforms="-plan9" -ldflags="-X main.version=\"$(make show-version)\"" github.com/prymitive/karma
         - for i in karma-*; do tar --mtime="${SOURCE_DATE_EPOCH}" --owner=0 --group=0 --numeric-owner -c $i | gzip -n - > $i.tar.gz; done
@@ -147,11 +147,11 @@ jobs:
         - export DOCKER_IMAGE=karma
         - export IMAGE_NAME="${DOCKER_USERNAME}/${DOCKER_IMAGE}"
         - make docker-image
-        - docker login -u "${DOCKER_USERNAME}" -p "${DOCKER_PASSWORD}"
+        - travis_retry docker login -u "${DOCKER_USERNAME}" -p "${DOCKER_PASSWORD}"
         - docker tag "${LOCAL_IMAGE}" "${IMAGE_NAME}:latest"
         # tag with the version only if we have a git tag (new release was pushed)
         - if [ -n "$TRAVIS_TAG" ]; then docker tag "${LOCAL_IMAGE}" "${IMAGE_NAME}:${VERSION}" ; fi
-        - docker push "${IMAGE_NAME}"
+        - travis_retry docker push "${IMAGE_NAME}"
 
     - stage: Deploy demo app to Heroku
       # deploy on every job that isn't a PR, this way we:
@@ -174,8 +174,8 @@ jobs:
         - echo "  password $HEROKU_TOKEN" >> $HOME/.netrc
       script:
         - docker build --build-arg VERSION=$(make show-version) -t registry.heroku.com/karma-demo/web -f demo/Dockerfile .
-        - docker login -u _ -p "$HEROKU_TOKEN" registry.heroku.com
-        - docker push registry.heroku.com/karma-demo/web
+        - travis_retry docker login -u _ -p "$HEROKU_TOKEN" registry.heroku.com
+        - travis_retry docker push registry.heroku.com/karma-demo/web
         # bundled heroku cli doesn't know anything about containers, update it
-        - curl https://cli-assets.heroku.com/install.sh | sh
-        - /usr/local/bin/heroku container:release web --app karma-demo
+        - travis_retry curl https://cli-assets.heroku.com/install.sh | sh
+        - travis_retry /usr/local/bin/heroku container:release web --app karma-demo