replace readlink -f with realpath in build scripts

readlink -f doesn't work on OS X

build

@@ -3,7 +3,7 @@
 set -eu
 
 # cd to location of script
-cd "$(dirname "$(readlink -f "$0")")"
+cd "$(dirname "$(realpath "$0")")"
 
 # Builds the docker images.
 # Usage: ./build {COMPONENTS}, or just ./build to build all.

generate-docker-compose

@@ -3,7 +3,7 @@
 set -eu
 
 # cd to location of script
-cd "$(dirname "$(readlink -f "$0")")"
+cd "$(dirname "$(realpath "$0")")"
 
 # We generate first, and capture the output, to avoid overwriting the file on error.
 # To avoid jsonnet needing to exist locally, we run it in a container.

get-build-tag

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # cd to location of script
-cd "$(dirname "$(readlink -f "$0")")"
+cd "$(dirname "$(realpath "$0")")"
 
 TAG=$(git rev-parse --short HEAD)
 if [ -n "$(git status --porcelain --untracked-files=no)" ]; then