change travis builds to publish docker images with tag 'nightly' (#66)

.travis.yml

@@ -40,7 +40,7 @@ deploy:
       all_branches: true
       repo: apache/incubator-openwhisk-runtime-python
   - provider: script
-    script: "./tools/travis/publish.sh openwhisk 3 latest && ./tools/travis/publish.sh openwhisk 3-ai latest && ./tools/travis/publish.sh openwhisk 3-loop latest"
+    script: "./tools/travis/publish.sh openwhisk 3 nightly && ./tools/travis/publish.sh openwhisk 3-ai nightly && ./tools/travis/publish.sh openwhisk 3-loop nightly"
     on:
       branch: master
       repo: apache/incubator-openwhisk-runtime-python

core/pythonAction/Dockerfile

@@ -16,7 +16,7 @@
 #
 
 # Dockerfile for python actions, overrides and extends ActionRunner from actionProxy
-FROM openwhisk/dockerskeleton:latest
+FROM openwhisk/dockerskeleton:nightly
 
 RUN apk add --no-cache \
         bzip2-dev \

tools/travis/publish.sh

@@ -51,8 +51,8 @@ TERM=dumb ./gradlew \
 -PdockerImagePrefix=${IMAGE_PREFIX} \
 -PdockerImageTag=${IMAGE_TAG}
 
-  # if doing latest also push a tag with the hash commit
-  if [ ${IMAGE_TAG} == "latest" ]; then
+  # if doing nightly also push a tag with the hash commit
+  if [ ${IMAGE_TAG} == "nightly" ]; then
   SHORT_COMMIT=`git rev-parse --short HEAD`
   TERM=dumb ./gradlew \
   :core:${RUNTIME}:distDocker \