Update synapse/Makefile, .gitlab-ci.yml files

synapse/Makefile

@@ -0,0 +1,18 @@
+NAMESPACE=alemairebe
+VERSION=v1.32.2
+
+IMAGE=synapse
+
+push: get decompress build
+
+get:
+	wget https://github.com/matrix-org/synapse/archive/refs/tags/$(VERSION).zip
+
+decompress:
+    unzip $(VERSION).zip
+
+build:
+	docker buildx build --platform linux/amd64,linux/arm64,linux/arm --push \
+    	  --cache-from=type=registry,ref=${NAMESPACE}/buildx:${IMAGE} \
+	  --cache-to=type=registry,ref=${NAMESPACE}/buildx:${IMAGE} \
+	  --tag ${CI_REGISTRY_IMAGE}/${IMAGE}:$(VERSION) ${IMAGE}-$(VERSION)