MF-370 - Simplify and refine CI (#541)

* Add CI script

Signed-off-by: Dusan Borovcanin <dusan.borovcanin@mainflux.com>

* Fix indentetion

Add script explanation comment.

Signed-off-by: Dusan Borovcanin <dusan.borovcanin@mainflux.com>

scripts/ci.sh

@@ -0,0 +1,44 @@
+# This script contains commands to be executed by the CI tool.
+
+setup_protoc() {
+	echo "Setup protoc..."
+	PROTOC_ZIP=protoc-3.6.1-linux-x86_64.zip
+	curl -0L https://github.com/google/protobuf/releases/download/v3.6.1/$PROTOC_ZIP -o $PROTOC_ZIP
+	unzip -o $PROTOC_ZIP -d protoc3
+	sudo mv protoc3/bin/* /usr/local/bin/
+	sudo mv protoc3/include/* /usr/local/include/
+	rm -f PROTOC_ZIP
+	go get -u github.com/golang/protobuf/protoc-gen-go \
+		github.com/gogo/protobuf/protoc-gen-gofast \
+		google.golang.org/grpc
+	export PATH=$PATH:/usr/local/bin/protoc
+}
+
+setup_mf() {
+	echo "Setup Mainflux..."
+	go get -d github.com/mainflux/mainflux
+	cd $GOPATH/src/github.com/mainflux/mainflux
+	make proto
+}
+
+setup() {
+	echo "Setting up..."
+	setup_protoc
+	setup_mf
+}
+
+run_test() {
+	echo "Running tests..."
+	set -e; echo "" > coverage.txt; for d in $(go list ./... | grep -v 'vendor\|cmd'); do GOCACHE=off go test -v -race -tags test -coverprofile=profile.out -covermode=atomic $d; if [ -f profile.out ]; then cat profile.out >> coverage.txt; rm profile.out; fi done
+}
+
+push() {
+	echo "Pushing Docker images..."
+	if test -n "$BRANCH_NAME" && test "$BRANCH_NAME" = "master"; then
+	make latest
+	fi
+}
+
+setup
+run_test
+push