Add "package-static.bash" helper script

Creates a tar.gz with a static build of gocryptfs and the man page.

build-without-openssl.bash

@@ -1,7 +1,5 @@
-#!/bin/bash
-
-set -eu
+#!/bin/bash -eu
 
 cd "$(dirname "$0")"
 
-CGO_ENABLED=0 ./build.bash -tags without_openssl
+CGO_ENABLED=0 source ./build.bash -tags without_openssl

package-static.bash

@@ -0,0 +1,25 @@
+#!/bin/bash -eu
+
+cd $(dirname "$0")
+
+# Compiles the gocryptfs binary and sets $GITVERSION
+source build-without-openssl.bash
+
+if ldd gocryptfs > /dev/null ; then
+	echo "error: compiled binary is not static"
+	exit 1
+fi
+
+# Build gocryptfs.1 man page
+./Documentation/MANPAGE-render.bash > /dev/null
+cp -a ./Documentation/gocryptfs.1 .
+
+ARCH=$(go env GOARCH)
+OS=$(go env GOOS)
+
+TARGZ=gocryptfs_${GITVERSION}_${OS}-static_${ARCH}.tar.gz
+
+tar czf $TARGZ gocryptfs gocryptfs.1
+
+echo "Tar created."
+echo "Hint for signing: gpg -u 23A02740 --armor --detach-sig $TARGZ"