Add make task for prereleasing docker container

Makefile

@@ -1,5 +1,6 @@
 PROJECT := dateilager
 VERSION := $(shell git describe --tags --abbrev=0)
+GIT_COMMIT := $(shell git rev-parse --short HEAD)
 BUILD_FLAGS := -ldflags="-s -w -X github.com/gadget-inc/dateilager/pkg/version.Version=$(VERSION)"
 
 DB_HOST ?= 127.0.0.1
@@ -201,6 +202,10 @@ else
 	docker push gcr.io/gadget-core-production/dateilager:latest
 endif
 
+upload-prerelease-container-image: release
+	docker build -t gcr.io/gadget-core-production/dateilager:$(GIT_COMMIT) .
+	docker push gcr.io/gadget-core-production/dateilager:$(GIT_COMMIT)
+
 run-container: release
 	docker build -t dl-local:latest .
 	docker run --rm -it -p 127.0.0.1:$(GRPC_PORT):$(GRPC_PORT)/tcp -v ./development:/home/main/secrets/tls -v ./development:/home/main/secrets/paseto dl-local:latest $(GRPC_PORT) "postgres://$(DB_USER):$(DB_PASS)@host.docker.internal:5432" dl