Create docker configuration for the api system

Author: zucchinidev

api/.dockerignore

@@ -0,0 +1,2 @@
+.git
+api

api/Dockerfile

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+FROM golang
+
+# if left blank app will run with dev settings
+# to build production image run:
+# $ docker build ./api --build-args app_env=production
+ARG app_env
+ENV APP_ENV $app_env
+
+
+COPY . /go/src/github.com/zucchinidev/building-distributed-system-golang/api
+WORKDIR /go/src/github.com/zucchinidev/building-distributed-system-golang/api
+
+RUN go get ./
+RUN go build
+
+# if dev setting will use pilu/fresh for code reloading via docker-compose volume sharing with local machine
+# if production setting will build binary
+CMD if [ ${APP_ENV} = production ]; \
+	then \
+	api; \
+	else \
+	go get github.com/pilu/fresh && \
+	fresh; \
+	fi
+
+EXPOSE 8080