Added Dockerfile

Dockerfile

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+FROM golang:1.15.6-alpine AS builder
+
+# Install missing pkgs
+RUN apk add --no-cache git
+
+# Set necessary environmet variables needed for our image
+ENV GO111MODULE=on \
+    CGO_ENABLED=0 \
+    GOOS=linux \
+    GOARCH=amd64
+
+# Set workdir in GOPATH
+WORKDIR $GOPATH/src/gitlab.larvit.se/power-plan/auth
+
+# Copy and download dependency using go mod
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+
+# Copy the source code
+COPY ./src ./src
+
+# Build the application
+RUN go build -o /build/main ./src
+
+# Move to /dist directory as the place for resulting binary folder
+WORKDIR /dist
+
+# Copy binary from build to main folder
+RUN cp /build/main .
+
+# Build a small image
+FROM scratch
+
+COPY --from=builder /dist/main /
+
+# Command to run
+ENTRYPOINT ["/main"]