remove Python 3.6 based runtime (#143)

Python 3.6 is past its end of life; therefore this runtime is no
longer receiving security updates.

Author: dgrove-oss

.github/workflows/ci.yaml

@@ -90,8 +90,6 @@ jobs:
           SHORT_COMMIT=$(git rev-parse --short "$GITHUB_SHA")
           ./gradlew :core:python3Action:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk -PdockerImageTag=nightly
           ./gradlew :core:python3Action:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk -PdockerImageTag=$SHORT_COMMIT
-          ./gradlew :core:python36AiAction:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk -PdockerImageTag=nightly
-          ./gradlew :core:python36AiAction:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk -PdockerImageTag=$SHORT_COMMIT
           ./gradlew :core:python39Action:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk -PdockerImageTag=nightly
           ./gradlew :core:python39Action:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk -PdockerImageTag=$SHORT_COMMIT
           ./gradlew :core:python310Action:distDocker -PdockerRegistry=docker.io -PdockerImagePrefix=openwhisk -PdockerImageTag=nightly
@@ -106,8 +104,6 @@ jobs:
           IMAGE_TAG=${GITHUB_REF_NAME##*@}
           if [ ${RUNTIME_VERSION} == "3" ]; then
             RUNTIME="python3Action"
-          elif [ ${RUNTIME_VERSION} == "3-ai" ]; then
-            RUNTIME="python36AiAction"
           elif [ ${RUNTIME_VERSION} == "39" ]; then
             RUNTIME="python39Action"
           elif [ ${RUNTIME_VERSION} == "310" ]; then

README.md

@@ -150,9 +150,6 @@ others.
 ./gradlew :tests:test --tests Python*Tests
 ```
 
-## Python 3 AI Runtime
-This action runtime enables developers to create AI Services with OpenWhisk. It comes with preinstalled libraries useful for running Machine Learning and Deep Learning inferences. [Read more about this runtime here](./core/python36AiAction).
-
 ## Using additional python libraries
 
 If you need more libraries for your Python action,  you can include a virtualenv in the zip file of the action.