Update Dockerfile, add .dockerignore

Dockerfile

@@ -1,11 +1,40 @@
-FROM golang:1.15-alpine
-ARG VERSION="develop"
-COPY . /go/wings/
-WORKDIR /go/wings/
-RUN apk add --no-cache upx \
-    && CGO_ENABLED=0 go build -ldflags="-s -w -X github.com/pterodactyl/wings/system.Version=${VERSION}" \
-    && upx wings
+# Stage 1 (Build)
+FROM        golang:1.15-alpine3.12 AS builder
 
-FROM alpine:latest
-COPY --from=0 /go/wings/wings /usr/bin/
-CMD ["wings", "--config", "/etc/pterodactyl/config.yml"]
+ARG         VERSION
+
+RUN         apk add --update --no-cache git=2.26.2-r0 make=4.3-r0 upx=3.96-r0
+
+WORKDIR     /app/
+
+COPY        go.mod go.sum /app/
+RUN         go mod download
+
+COPY        . /app/
+
+RUN         CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+                -ldflags="-s -w -X github.com/pterodactyl/wings/system.Version=$VERSION" \
+                -v \
+                -trimpath \
+                -o wings \
+                wings.go
+
+RUN         upx wings
+
+# --------------------------------------- #
+
+# Stage 2 (Final)
+FROM        busybox:1.32.0
+
+LABEL       org.opencontainers.image.title="Wings"
+LABEL       org.opencontainers.image.version="v1.1.3"
+LABEL       org.opencontainers.image.description="Server control layer for Pterodactyl"
+LABEL       org.opencontainers.image.url="https://pterodactyl.io"
+LABEL       org.opencontainers.image.documentation="https://pterodactyl.io/project/introduction.html"
+LABEL       org.opencontainers.image.vendor="Pterodactyl Software"
+LABEL       org.opencontainers.image.source="https://github.com/pterodactyl/wings"
+LABEL       org.opencontainers.image.licenses="MIT"
+
+COPY        --from=builder /app/wings /usr/bin/
+
+CMD         [ "wings", "--config", "/etc/pterodactyl/config.yml" ]