Add gpg signing rule in Makefile

Makefile

@@ -9,7 +9,7 @@ TEST          = phpunit
 
 .PHONY: build
 
-build:
+build/phpbrew:
 	php bin/phpbrew compile \
 			--lib src \
 			--lib vendor/corneltek/cliframework/src \
@@ -29,9 +29,14 @@ build:
 			--executable \
 			--no-compress \
 			--output $(OUTPUT)
-		$(COPY) $(OUTPUT) $(TARGET)
-		$(COPY) $(OUTPUT) build/phpbrew
-		$(PERMISSION) $(TARGET)
+	$(COPY) $(OUTPUT) $(TARGET)
+	$(COPY) $(OUTPUT) build/phpbrew
+	$(PERMISSION) $(TARGET)
+
+build: build/phpbrew
+
+sign: build
+	gpg --armor --detach-sign build/phpbrew
 
 install:
 		$(SUDOCP) $(TARGET) $(INSTALL_PATH)

phpbrew.asc

@@ -0,0 +1,10 @@
+-----BEGIN PGP SIGNATURE-----
+
+iQEcBAABCAAGBQJWZUfhAAoJED2CCGF/5sz28NUH/1vH/4C81PFKair7UR/t59D1
+7mcxympHnjC6rVRjLyu2eJ3AK0rqb3Ele/BV/q53nfsvaAyMy6LIT9MZyoApo5pT
+qaYrjcHYSyq7q2geuViPkmvlFsBdep7tROfsubplvD3gisQm1aUjaLy/Siz8drfB
+xS0bsf2mwF86phmnNfnqi9zC7tOBhqQpV4O8uTsHj3pz1IyHq7gIKSuMLH6kWOsh
+LS0G/Ldwk7sqk3WAV7UtcGZwu/8q4R6RG5MNIzq8OUS3hy1BINa9sW+R7E/Ijgk0
+M9ctpNIPZwGihMrbpqIF32jeAjmow3xGoPTzFzGDKxk+G20Ek2Dci2Txh7YK0Fo=
+=wWVQ
+-----END PGP SIGNATURE-----