terraform-alpine: Install terraform into $PATH

Installing it without the leading slash makes invoking terraform via
this container more like invoking terraform installed locally on the
host system (e.g. via a package manager).

buildah-from-alpine/terraform-alpine.sh

@@ -9,11 +9,11 @@ ctr=$(buildah from alpine) || (echo "Must be root to execute buildah" && exit 1)
 mnt=`buildah mount $ctr` || (echo "Must be root to execute buildah" && exit 1)
 wget https://releases.hashicorp.com/terraform/0.11.7/terraform_0.11.7_linux_amd64.zip
 unzip terraform_0.11.7_linux_amd64.zip
-cp terraform $mnt || exit 1
+cp terraform "${mnt}/usr/bin" || exit 1
 buildah unmount $ctr
 buildah config $ctr
 buildah commit $ctr terraform-alpine:v0.11.7
 set +x
-echo "run 'podman run -v "$PWD":"$PWD":ro -v /tmp:/tmp:rw terraform-alpine:v0.11.7 /terraform fmt -list -check -write=false' to terraform fmt source"
+echo "run 'podman run -v "$PWD":"$PWD":ro -v /tmp:/tmp:rw terraform-alpine:v0.11.7 terraform fmt -list -check -write=false' to terraform fmt source"
 echo "to cleanup run 'podman stop [containerid from podman run]; podman rm [containerid from podman run]'"
 echo "to push to docker-daemon run 'buildah push [imageID] docker-daemon:terraform-alpine:v0.11.7'"