Changing nginx from alpine to ubuntu bionic (#4549)

Changing nginx from alpine to ubuntu bionic.

What motivated the change is this issue on alpine: https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.13.0#time64_requirements 
Our Tier 1 support Raspbian Stretch is impacted by the issue.

Reverting to previous Alpine is not an option because of security concern. Setting the image temporarily to Ubuntu Bionic Beaver(18.04).
The impact is an increase of image size from 18Mb to 108Mb.

TEST:
Deployed al level5 on raspberryPI stretch
Before:
Sun Jan  0 00:100:4174038  1900
After:
Fri Mar  5 04:32:13 UTC 2021

Note: Strangely I didn't see any crash. Only the date was wrong.

edge-modules/api-proxy-module/docker/linux/arm32v7/Dockerfile

@@ -3,7 +3,7 @@
 # Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
 #-------------------------------------------------------------------------------------------------------------
 
-FROM arm32v7/nginx:1.19.7-alpine
+FROM arm32v7/nginx:1.19.7
 WORKDIR /app
 COPY ./docker/linux/arm32v7/api-proxy-module .
 COPY ./docker/linux/arm32v7/templates .

scripts/linux/buildAPIProxy.sh

@@ -110,7 +110,7 @@ process_args()
 
     case ${ARCH} in
         amd64) TARGET="x86_64-unknown-linux-musl";;
-        arm32v7) TARGET="armv7-unknown-linux-musleabihf";;
+        arm32v7) TARGET="armv7-unknown-linux-gnueabihf";;
         arm64v8) TARGET="aarch64-unknown-linux-gnu";;
     esac
 
@@ -153,9 +153,9 @@ build_project()
     if [[ "$ARCH" == "amd64" ]]; then
         execute scripts/linux/cross-platform-rust-build.sh --os alpine --arch "amd64" --build-path edge-modules/api-proxy-module
     elif [[ "$ARCH" == "arm32v7" ]]; then
-        execute scripts/linux/cross-platform-rust-build.sh --os alpine --arch "arm32v7" --build-path edge-modules/api-proxy-module
+        execute scripts/linux/cross-platform-rust-build.sh --os ubuntu18.04 --arch "arm32v7" --build-path edge-modules/api-proxy-module
     elif [[ "$ARCH" == "arm64v8" ]]; then
-        execute scripts/linux/cross-platform-rust-build.sh --os alpine --arch "aarch64" --build-path edge-modules/api-proxy-module
+        execute scripts/linux/cross-platform-rust-build.sh --os ubuntu18.04 --arch "aarch64" --build-path edge-modules/api-proxy-module
     else
         echo "Cannot run script Unsupported architecture $ARCH"
         exit 1