.github/workflows/config.yml: add --platform for qemu environment

Fixes
```
+ docker run --rm --platform linux/amd64 -v /home/runner/work/EusLisp/EusLisp:/ws/euslisp -e ARCH=LinuxARM -t arm32v7/debian:unstable-slim bash -c '      set -x; set -e;      apt update -qq;      apt install -y -qq make gcc libgl-dev libglu1-mesa-dev libjpeg-dev libpng-dev libpq-dev libx11-dev libxext-dev;      CFLAGS='\''-Werror=implicit-function-declaration'\'' ARCH=LinuxARM EUSDIR=/ws/euslisp make -C /ws/euslisp/lisp/ -f Makefile.LinuxARM eus0;      CC='\''gcc -Werror'\'' ARCHDIR=LinuxARM EUSDIR=/ws/euslisp make -C /ws/euslisp/lisp/image/jpeg;      exit 0'
Unable to find image 'arm32v7/debian:unstable-slim' locally
unstable-slim: Pulling from arm32v7/debian
docker: no matching manifest for linux/amd64 in the manifest list entries.
```

.github/workflows/config.yml

@@ -48,9 +48,9 @@ jobs:
           export TRAVIS_OS_NAME=linux
           export DOCKER_IMAGE=${{matrix.DOCKER_IMAGE}}
           if [[ "$DOCKER_IMAGE" == *"arm"* ]]; then sudo apt-get install -y -qq qemu-user-static git; fi
-          if [[ "$DOCKER_IMAGE" == *"arm64v8"* ]]; then export QEMU_VOLUME="-v /usr/bin/qemu-aarch64-static:/usr/bin/qemu-aarch64-static"; fi #
+          if [[ "$DOCKER_IMAGE" == *"arm64v8"* ]]; then export QEMU_VOLUME="-v /usr/bin/qemu-aarch64-static:/usr/bin/qemu-aarch64-static"; export PLATFORM_OPTION="--platform linux/aarch64"; fi #
           echo "Testing branch $TRAVIS_BRANCH of $REPOSITORY_NAME"
-          docker run --rm $QEMU_VOLUME -v $CI_SOURCE_PATH:$CI_SOURCE_PATH -e "DOCKER_IMAGE=$DOCKER_IMAGE" -e "COLLISION_LIB=$COLLISION_LIB" -e "CI_SOURCE_PATH=$CI_SOURCE_PATH" -e "HOME=$HOME" -t $DOCKER_IMAGE sh -c "cd $CI_SOURCE_PATH; ./.travis.sh"
+          docker run $PLATFORM_OPTION --rm $QEMU_VOLUME -v $CI_SOURCE_PATH:$CI_SOURCE_PATH -e "DOCKER_IMAGE=$DOCKER_IMAGE" -e "COLLISION_LIB=$COLLISION_LIB" -e "CI_SOURCE_PATH=$CI_SOURCE_PATH" -e "HOME=$HOME" -t $DOCKER_IMAGE sh -c "cd $CI_SOURCE_PATH; ./.travis.sh"
 
   catkin:
     runs-on: ubuntu-latest