[Add docker stuff]

Dockerfile

@@ -0,0 +1,21 @@
+FROM golang:1.23.4-alpine3.21 AS build-stage
+
+WORKDIR /usr/src/app
+
+COPY ./go.mod ./go.sum ./
+RUN [ "go", "mod", "download" ]
+
+COPY *.go ./
+RUN [ "go", "build", "." ]
+
+FROM alpine:3.14 AS prod-stage
+
+WORKDIR /app
+
+COPY --from=build-stage /usr/src/app/binaryimage .
+COPY ./static/ ./static/
+COPY ./views/ ./views/
+
+EXPOSE 3000
+
+ENTRYPOINT [ "./binaryimage" ]

docker-compose.yml

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+services:
+  binaryimage:
+    build: .
+    environment:
+      - BI_MAX_FILE_SIZE=4194304 # 4MiB
+    ports:
+      - "3000:3000"