binary assets

builder.Dockerfile

@@ -1,6 +1,10 @@
-# CI builder image for Ebitengine projects: Go toolchain + packaging tools.
-# Used by the `build` step in example-woodpecker.yaml instead of installing
-# zip/make/curl on every pipeline run.
+# CI builder image for Ebitengine projects: Go toolchain + packaging tools
+# + the X11/GL/ALSA dev libraries needed for the native linux-x64 (cgo) build.
+# Used by the `build` and `binaries` steps in example-woodpecker.yaml instead
+# of installing everything on every pipeline run.
+#
+# Debian-based (not alpine): the linux-x64 game binary must link against
+# glibc, otherwise it won't run on regular desktop distros.
 #
 # Build & push (the CI runner is linux/amd64):
 #   docker build --platform linux/amd64 -f builder.Dockerfile \
@@ -8,10 +12,18 @@
 #   docker push git.teletypegames.org/internal/ebitengine-builder:latest
 
 # 1.26 covers every current game repo's go.mod directive (1.25.x, 1.26.x).
-FROM golang:1.26-alpine
+FROM golang:1.26-bookworm
 
-RUN apk add --no-cache git make zip curl
+# Ebitengine linux build dependencies:
+# https://ebitengine.org/en/documents/install.html (Debian/Ubuntu section)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        git make zip curl jq pkg-config \
+        libc6-dev libgl1-mesa-dev libglu1-mesa-dev \
+        libx11-dev libxcursor-dev libxi-dev libxinerama-dev \
+        libxrandr-dev libxxf86vm-dev \
+        libasound2-dev \
+    && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /workspace
 
-CMD ["/bin/sh"]
+CMD ["/bin/bash"]