feat: add dockerfile

.dockerignore

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+.env

Dockerfile

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+##### Stage 1 #####
+
+### Use golang:1.18 as base image for building the application
+FROM golang:1.19 as builder
+
+### Create new directly and set it as working directory
+RUN mkdir -p /app
+WORKDIR /app
+
+### Copy Go application dependency files
+COPY go.mod .
+COPY go.sum .
+
+### Setting a proxy for downloading modules
+ENV GOPROXY https://proxy.golang.org,direct
+
+### Download Go application module dependencies
+RUN go mod download
+
+### Copy actual source code for building the application
+COPY . .
+
+### CGO has to be disabled cross platform builds
+### Otherwise the application won't be able to start
+ENV CGO_ENABLED=0
+
+### Build the Go app for a linux OS
+### 'scratch' and 'alpine' both are Linux distributions
+RUN GOOS=linux go build ./main.go
+
+##### Stage 2 #####
+
+### Define the running image
+FROM scratch
+
+### Alternatively to 'FROM scratch', use 'alpine':
+# FROM alpine:3.13.1
+
+### Set working directory
+WORKDIR /app
+
+### Copy built binary application from 'builder' image
+COPY --from=builder /app/main .
+
+### Copy the certs from builder
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+
+### Run the binary application
+CMD ["/app/main"]