build: use Alpine as base image

Author: kdkasad

.dockerignore

@@ -1,3 +1,6 @@
+# CI workflows
+.github/
+
 # flyctl launch added from .gitignore
 # Based on https://raw.githubusercontent.com/github/gitignore/main/Node.gitignore
 

Dockerfile

@@ -1,4 +1,6 @@
-FROM oven/bun AS build
+FROM docker.io/oven/bun:1-alpine AS builder
+
+RUN apk add python3
 
 WORKDIR /app
 
@@ -9,14 +11,17 @@ RUN bun install --frozen-lockfile
 
 COPY src ./src
 
-RUN bun build ./src/index.ts --compile --outfile bot
+RUN bun build --compile --minify --sourcemap --bytecode --outfile bot ./src/index.ts
+
+FROM docker.io/alpine:3
 
-FROM ubuntu:22.04
+# For some reason, Bun single-file executables targeting musl require libstdc++
+RUN apk --no-cache add libstdc++
 
 WORKDIR /app
 
-COPY --from=build /app/bot /app/bot
+COPY --from=builder /app/bot /app/bot
 
 ENV TZ=America/Indiana/Indianapolis
 
-CMD ["/app/bot"]
+ENTRYPOINT ["/app/bot"]