CI: add target build ci action

Add github action to check build for different targets.
This action replaces the travis test.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>

.github/actions/build_ci/Dockerfile

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+FROM ubuntu:latest
+
+ENV LANG C.UTF-8
+ENV LC_ALL C.UTF-8
+
+# Install prerequisites
+RUN apt-get --quiet=2 update && apt-get install --quiet=2 --assume-yes sudo git python3 python3-pip wget
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/build_ci/README.md

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+# Libmetal build check docker action
+
+This action test builds for a specified target.
+
+## Inputs
+
+### `target`
+
+**Required** the build target. Default `"linux"`.
+The supported taget are:
+  linux
+  generic arm
+  freertos
+  zephyr
+
+
+## Example usage
+
+uses: ./.github/actions/build_ci
+with:
+  target: freertos

.github/actions/build_ci/action.yml

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+# action.yml
+name: 'Target Build'
+description: 'Compile for a specified target'
+
+inputs:
+  target:
+    description: 'build target'
+    default: 'linux'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.target }}

.github/actions/build_ci/entrypoint.sh

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+#!/bin/bash
+
+readonly TARGET="$1"
+
+ZEPHYR_TOOLCHAIN_VARIANT=zephyr
+ZEPHYR_SDK_INSTALL_DIR=/opt/zephyr-sdk
+ZEPHYR_SDK_VERSION=0.11.4
+ZEPHYR_SDK_DOWNLOAD_FOLDER=https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v$ZEPHYR_SDK_VERSION
+ZEPHYR_SDK_SETUP_BINARY=zephyr-sdk-$ZEPHYR_SDK_VERSION-setup.run
+ZEPHYR_SDK_DOWNLOAD_URL=$ZEPHYR_SDK_DOWNLOAD_FOLDER/$ZEPHYR_SDK_SETUP_BINARY
+
+FREERTOS_ZIP_URL=https://cfhcable.dl.sourceforge.net/project/freertos/FreeRTOS/V10.0.1/FreeRTOSv10.0.1.zip
+
+pre_build(){
+	# fix issue related to tzdata install
+	echo 'Etc/UTC' > /etc/timezone &&
+	ln -s /usr/share/zoneinfo/Etc/UTC /etc/localtime &&
+	apt update &&
+   	apt-get install -y cmake make
+}
+
+build_linux(){
+	echo  " Build for linux"
+	apt-get install -y libsysfs-dev libhugetlbfs-dev gcc &&
+	mkdir -p build-linux &&
+	cd build-linux &&
+	cmake .. -DWITH_TESTS_EXEC=on &&
+	make VERBOSE=1 all test &&
+	exit 0
+}
+
+build_generic(){
+	echo  " Build for generic platform "
+      	apt-get install -y gcc-arm-none-eabi &&
+	mkdir -p build-generic &&
+	cd build-generic &&
+	cmake .. -DCMAKE_TOOLCHAIN_FILE=template-generic &&
+	make VERBOSE=1 &&
+	exit 0
+}
+
+build_freertos(){
+	echo  " Build for freertos OS "
+      	apt-get install -y gcc-arm-none-eabi unzip &&
+      	wget $FREERTOS_ZIP_URL > /dev/null &&
+      	unzip FreeRTOSv10.0.1.zip > /dev/null &&
+	mkdir -p build-freertos &&
+	cd build-freertos && export &&
+      	cmake .. -DCMAKE_TOOLCHAIN_FILE=template-freertos -DCMAKE_C_FLAGS="-I$PWD/../FreeRTOSv10.0.1/FreeRTOS/Source/include/ -I$PWD/../FreeRTOSv10.0.1/FreeRTOS/Demo/CORTEX_STM32F107_GCC_Rowley -I$PWD/../FreeRTOSv10.0.1/FreeRTOS/Source/portable/GCC/ARM_CM3" &&
+	make VERBOSE=1 &&
+	exit 0
+}
+
+build_zephyr(){
+	echo  " Build for Zephyr OS "
+        sudo apt-get install libc6-dev-i386 make gperf gcc g++ python3-ply python3-yaml python3-pip device-tree-compiler ncurses-dev uglifyjs -qq &&
+        sudo pip3 install pyelftools &&
+	pip3 install --user -U west
+	echo 'export PATH=~/.local/bin:"$PATH"' >> ~/.bashrc
+	source ~/.bashrc
+
+	wget $ZEPHYR_SDK_DOWNLOAD_URL &&
+    	chmod +x $ZEPHYR_SDK_SETUP_BINARY &&
+    	rm -rf $ZEPHYR_SDK_INSTALL_DIR &&
+    	./$ZEPHYR_SDK_SETUP_BINARY --quiet -- -y -d $ZEPHYR_SDK_INSTALL_DIR 2> /dev/null &&
+
+	west init ./zephyrproject
+	cd ./zephyrproject
+	west update
+	west zephyr-export
+	pip3 install --user -r ./zephyr/scripts/requirements.txt
+
+    	cd ./zephyr &&
+    	source zephyr-env.sh &&
+	cd ../.. &&
+	cmake . -DWITH_ZEPHYR=on -DBOARD=qemu_cortex_m3 -DWITH_TESTS=on -Bbuild-zephyr &&
+	cd build-zephyr &&
+	make VERBOSE=1 &&
+	exit 0
+}
+
+main(){
+	pre_build;
+
+	if [[ "$TARGET" == "linux" ]]; then
+   		build_linux
+   	fi
+	if [[ "$TARGET" == "generic" ]]; then
+   		build_generic
+   	fi
+	if [[ "$TARGET" == "freertos" ]]; then
+   		build_freertos
+   	fi
+	if [[ "$TARGET" == "zephyr" ]]; then
+   		build_zephyr
+   	fi
+}
+
+main