scripts/installer.sh: add FreeBSD 14 (#14925)

Fixes #14745

Also adds --yes to pkg to match other package managers

Signed-off-by: Erisa A <erisa@tailscale.com>

scripts/installer.sh

@@ -390,7 +390,8 @@ main() {
 			;;
 		freebsd)
 			if [ "$VERSION" != "12" ] && \
-			   [ "$VERSION" != "13" ]
+			   [ "$VERSION" != "13" ] && \
+			   [ "$VERSION" != "14" ]
 			then
 				OS_UNSUPPORTED=1
 			fi
@@ -572,7 +573,7 @@ main() {
 			;;
 		pkg)
 			set -x
-			$SUDO pkg install tailscale
+			$SUDO pkg install tailscale --yes
 			$SUDO service tailscaled enable
 			$SUDO service tailscaled start
 			set +x