revert to alpine 3.12 due to dns issue

docker/Dockerfile.linux.amd64

@@ -1,4 +1,4 @@
-FROM alpine:3.13
+FROM alpine:3.12
 RUN apk add --no-cache ca-certificates git git-lfs openssh curl perl aws-cli
 
 ADD posix/* /usr/local/bin/

docker/Dockerfile.linux.arm

@@ -1,4 +1,4 @@
-FROM arm32v6/alpine:3.13
+FROM arm32v6/alpine:3.12
 RUN apk add --no-cache ca-certificates git git-lfs openssh curl perl
 
 ADD posix/* /usr/local/bin/

docker/Dockerfile.linux.arm6

@@ -1,4 +1,4 @@
-FROM arm32v6/alpine:3.13
+FROM arm32v6/alpine:3.12
 RUN apk add --no-cache ca-certificates git git-lfs openssh curl perl
 
 ADD posix/* /usr/local/bin/

docker/Dockerfile.linux.arm64

@@ -1,4 +1,4 @@
-FROM arm64v8/alpine:3.13
+FROM arm64v8/alpine:3.12
 RUN apk add --no-cache ca-certificates git git-lfs openssh curl perl
 
 ADD posix/* /usr/local/bin/

docker/Dockerfile.linux.arm7

@@ -1,4 +1,4 @@
-FROM arm32v6/alpine:3.13
+FROM arm32v6/alpine:3.12
 RUN apk add --no-cache ca-certificates git git-lfs openssh curl perl
 
 ADD posix/* /usr/local/bin/

docker/Dockerfile.linux.arm8

@@ -1,4 +1,4 @@
-FROM arm64v8/alpine:3.13
+FROM arm64v8/alpine:3.12
 RUN apk add --no-cache ca-certificates git git-lfs openssh curl perl
 
 ADD posix/* /usr/local/bin/

posix/clone

@@ -4,11 +4,19 @@ if [[ ! -z "${DRONE_WORKSPACE}" ]]; then
 	cd ${DRONE_WORKSPACE}
 fi
 
+# if the home directory is not set (which should
+# never be the case) we should set to /root
+
+if [[ -z "${HOME}" ]]; then
+	echo "HOME directory not set; default to /root"
+	export HOME=/root
+fi
+
 # if the netrc enviornment variables exist, write
 # the netrc file.
 
 if [[ ! -z "${DRONE_NETRC_MACHINE}" ]]; then
-	cat <<EOF > /root/.netrc
+	cat <<EOF > ${HOME}/.netrc
 machine ${DRONE_NETRC_MACHINE}
 login ${DRONE_NETRC_USERNAME}
 password ${DRONE_NETRC_PASSWORD}
@@ -20,12 +28,12 @@ fi
 # known hosts file.
 
 if [[ ! -z "${DRONE_SSH_KEY}" ]]; then
-	mkdir /root/.ssh
-	echo -n "$DRONE_SSH_KEY" > /root/.ssh/id_rsa
-	chmod 600 /root/.ssh/id_rsa
+	mkdir ${HOME}/.ssh
+	echo -n "$DRONE_SSH_KEY" > ${HOME}/.ssh/id_rsa
+	chmod 600 ${HOME}/.ssh/id_rsa
 
-	touch /root/.ssh/known_hosts
-	chmod 600 /root/.ssh/known_hosts
+	touch ${HOME}/.ssh/known_hosts
+	chmod 600 ${HOME}/.ssh/known_hosts
 	ssh-keyscan -H ${DRONE_NETRC_MACHINE} > /etc/ssh/ssh_known_hosts 2> /dev/null
 fi