Add support for building in docker

Makefile

@@ -1,3 +1,24 @@
+# If the first argument is "in_docker"...
+ifeq (in_docker,$(firstword $(MAKECMDGOALS)))
+  # use the rest as arguments for "in_docker"
+  MAKE_ARGS := $(wordlist 2,$(words $(MAKECMDGOALS)),$(MAKECMDGOALS))
+  # Ignore the next args
+  $(eval $(MAKE_ARGS):;@:)
+
+  .ONESHELL:
+  in_docker:
+	docker build -f ./docker/Dockerfile.make -t woodpecker/make:local .
+	docker run -it \
+		-e VERSION="$(VERSION)" \
+		-e CI_COMMIT_SHA="$(CI_COMMIT_SHA)" \
+		-e GO_PACKAGES="$(GO_PACKAGES)" \
+		-e TARGETOS="$(TARGETOS)" \
+		-e TARGETARCH="$(TARGETARCH)" \
+		-v $(PWD):/build --rm woodpecker/make:local make $(MAKE_ARGS)
+else
+
+# Proceed with normal make
+
 GOFILES_NOVENDOR = $(shell find . -type f -name '*.go' -not -path "./vendor/*" -not -path "./.git/*")
 GO_PACKAGES ?= $(shell go list ./... | grep -v /vendor/)
 
@@ -155,3 +176,5 @@ bundle: bundle-agent bundle-server bundle-cli
 .PHONY: version
 version:
 	@echo ${BUILD_VERSION}
+
+endif

docker/Dockerfile.make

@@ -0,0 +1,13 @@
+# docker build --rm  -f docker/Dockerfile.server -t woodpeckerci/woodpecker-server .
+FROM golang:1.16-alpine as golang_image
+FROM node:16-alpine
+
+RUN apk add make gcc musl-dev
+
+# Build packages.
+COPY --from=golang_image /usr/local/go /usr/local/go
+ENV PATH=$PATH:/usr/local/go/bin
+
+WORKDIR /build
+
+CMD [ "sh" ]