Add freebsd to goreleaser config

While at it, fixed the hook upx script to run per file, and ignore
binaries which are not supported.

.goreleaser.yaml

@@ -11,6 +11,7 @@ builds:
       - -s -w
     goos:
       - linux
+      - freebsd
       - windows
     goarch:
       - 386
@@ -26,7 +27,11 @@ builds:
       - softfloat
     main: ./cmd/ctrld
     hooks:
-      post: /bin/sh ./scripts/upx.sh
+      post: /bin/sh ./scripts/upx.sh {{ .Path }}
+    ignore:
+      - goos: freebsd
+        goarch: arm
+        goarm: 5
 archives:
   - format_overrides:
       - goos: windows

scripts/upx.sh

@@ -2,6 +2,22 @@
 
 set -ex
 
-for dist_dir in ./dist/ctrld*; do
-  upx --brute "${dist_dir}/ctrld"
-done
+binary=$1
+
+if [ -z "$binary" ]; then
+  echo >&2 "Usage: $0 <binary>"
+  exit 1
+fi
+
+case "$binary" in
+  *_freebsd_*)
+    echo >&2 "upx does not work with freebsd binary yet"
+    exit 0
+    ;;
+  *_windows_arm*)
+    echo >&2 "upx does not work with windows arm/arm64 binary yet"
+    exit 0
+    ;;
+esac
+
+upx -- "$binary"