Remove Python 2 (#315)

* Bump dev to 3.0.0-beta.3

* Remove Python2 from alpine builds

Author: hardillb

.docker/Dockerfile.alpine

@@ -44,7 +44,7 @@ COPY flows.json /data
 FROM base AS build
 
 # Install Build tools
-RUN apk add --no-cache --virtual buildtools build-base linux-headers udev python2 && \
+RUN apk add --no-cache --virtual buildtools build-base linux-headers udev python3 && \
     npm install --unsafe-perm --no-update-notifier --no-audit --no-fund --only=production && \
     /tmp/remove_native_gpio.sh && \
     cp -R node_modules prod_node_modules

docker-custom/Dockerfile.custom

@@ -43,7 +43,7 @@ COPY flows.json /data
 FROM base AS build
 
 # Install Build tools
-RUN apk add --no-cache --virtual buildtools build-base linux-headers udev python2 && \
+RUN apk add --no-cache --virtual buildtools build-base linux-headers udev python3 && \
     npm install --unsafe-perm --no-update-notifier --no-fund --only=production && \
     /tmp/remove_native_gpio.sh && \
     cp -R node_modules prod_node_modules

docker-custom/scripts/install_devtools.sh

@@ -4,7 +4,7 @@ set -ex
 # Installing Devtools
 if [[ ${TAG_SUFFIX} != *"minimal" ]]; then
   echo "Installing devtools"
-  apk add --no-cache --virtual devtools build-base linux-headers udev python2 python3
+  apk add --no-cache --virtual devtools build-base linux-headers udev python3
 else
   echo "Skip installing devtools"
 fi