use different alpine image for arm, add config for php images+arm

.gitignore

@@ -13,3 +13,4 @@ pip-selfcheck.json
 /docker-compose.yml
 /.idea
 /.vscode
+qemu-arm-static

tests/build_arm.sh

@@ -1,4 +1,9 @@
 #!/bin/bash -x
 
-export DISTRO="hypriot/rpi-alpine"
-docker-compose -f build.yml build --build-arg DISTRO=$DISTRO # --parallel
+DISTRO="balenalib/rpi-alpine"
+PHP="arm32v7/php:7.2-apache"
+QEMU="$(which qemu-arm-static)"
+cp $QEMU ../webmails/rainloop/
+cp $QEMU ../webmails/roundcube/
+
+docker-compose -f build.yml build --build-arg DISTRO=$DISTRO --build-arg PHP_DISTRO=$PHP # --parallel