chore: remove Docker packaging and its docs

Drop the container image path entirely: Dockerfile, .dockerignore,
compose.yaml, and the docker.yml GHCR-publish workflow. Strip the Docker
documentation that went with it — the README "🐳 Run with Docker" section and
the container/`make musl` build blurb, plus the docs-site installation page's
"Run with Docker (recommended)" section and its Mac→Docker-Desktop pointer
(macOS now points straight at build-from-source).

Also drop the `make musl` target: its only consumer was the FROM-scratch
image, so it's orphaned once Docker is gone. The underlying LIBC=musl
static-build path in scripts/xbuild-tile57.sh is kept.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: beetlebugorg

.dockerignore

@@ -27,7 +27,7 @@ CACHE ?= $(if $(XDG_CACHE_HOME),$(XDG_CACHE_HOME),$(HOME)/.cache)/chartplotter
 S101_PC    ?= $(HOME)/Projects/s101-portrayal-catalogue/PortrayalCatalog
 S101_FC    ?= $(HOME)/Projects/s101-feature-catalogue/S-101FC/FeatureCatalogue.xml
 
-.PHONY: build build-tile57 tile57-lib vendor-style-engine xbuild xbuild-tile57 musl test vet fmt fmt-check tidy clean clear-cache serve docs docs-shots bake-ienc bake-noaa serve-widget demo demo-chart1 serve-demo preslib-chart1 s64-pages
+.PHONY: build build-tile57 tile57-lib vendor-style-engine xbuild xbuild-tile57 test vet fmt fmt-check tidy clean clear-cache serve docs docs-shots bake-ienc bake-noaa serve-widget demo demo-chart1 serve-demo preslib-chart1 s64-pages
 
 # Prebaked prod test set (US Inland ENC bundle + the NOAA world archive).
 # NB: keep these as bare values with NO inline `#` comments — Make folds any
@@ -137,20 +137,6 @@ build-tile57: build ## Alias for `build` (libtile57 is the sole engine now)
 xbuild xbuild-tile57: $(TILE57)/include/tile57.h ## Cross-compile CGO+libtile57 binaries with zig cc (linux+windows; darwin builds on a Mac runner)
 	VERSION="$(VERSION)" TILE57="$(TILE57)" ENGINE_COMMIT="$(ENGINE_COMMIT)" scripts/xbuild-tile57.sh
 
-# Fully-static musl binaries for the tiny FROM scratch Docker image (the "go-dims"
-# pattern): CGO+libtile57 linked against musl STATICALLY via zig cc, so `ldd` reports
-# "not a dynamic executable" and the binary drops straight into `FROM scratch`. Builds
-# linux/amd64 + linux/arm64 into dist/chartplotter_linux_<arch>_musl (same zig-cc
-# cross-build as xbuild — no QEMU; one host cross-links both arches by target swap).
-# The Dockerfile calls scripts/xbuild-tile57.sh with LIBC=musl directly; this target
-# is the local/CI equivalent. musl-static is strictly more portable than the gnu
-# xbuild (no glibc floor), so it's the recommended linux artifact — the gnu xbuild
-# path is kept intact for anyone who needs a glibc-dynamic build.
-MUSL_PLATFORMS ?= linux/amd64 linux/arm64
-musl: $(TILE57)/include/tile57.h ## Build fully-static musl binaries (linux amd64+arm64) into dist/ for the scratch Docker image
-	VERSION="$(VERSION)" TILE57="$(TILE57)" ENGINE_COMMIT="$(ENGINE_COMMIT)" \
-	  LIBC=musl PLATFORMS="$(MUSL_PLATFORMS)" scripts/xbuild-tile57.sh
-
 serve: build ## Serve the web frontend + provisioning API on :8080 (HOST/PORT/ASSETS overridable)
 	$(BIN) serve --host $(HOST) --port $(PORT) --assets $(ASSETS)
 

.github/workflows/docker.yml

@@ -117,35 +117,6 @@ of the chart — **instrument gauges**, custom overlays, routes, and more — wi
 forking the core. NMEA 0183 own-ship and AIS are the first slice of that; expect
 the surface to grow and change.
 
-## 🐳 Run with Docker
-
-The simplest way to run chartplotter — and the primary path for the
-**server-hub-on-a-boat** model (a Raspberry Pi, laptop, or mini PC that holds all
-chart state while every screen just points a browser at it) — is the published
-container image:
-
-```sh
-docker run -p 8080:8080 -v chartplotter-data:/data \
-  ghcr.io/beetlebugorg/chartplotter
-# open http://localhost:8080
-```
-
-Or with Docker Compose ([`compose.yaml`](compose.yaml)):
-
-```sh
-docker compose up -d
-```
-
-The image is **multi-arch** (`linux/amd64` + `linux/arm64`), so the same command
-runs on a Raspberry Pi and on an amd64 box. It's built `FROM scratch` around a
-**fully-static musl binary**, so it's tiny — essentially just the ~26 MB binary
-plus a CA bundle. The named `/data` volume holds the ENC source, baked tiles, and
-settings, and survives image upgrades. **macOS / Windows** users run the same
-image via **Docker Desktop** — no native Mac/Windows binary needed.
-
-Native binaries (below) remain available as a secondary option for bare-metal
-installs.
-
 ## 📦 Install & build
 
 **Download a binary.** Every tagged release publishes a self-contained
@@ -154,8 +125,7 @@ installs.
 the archive for your platform and run it — the S-101 catalogue and web frontend
 are baked in, so you supply only the ENC cells. **macOS** is not shipped as a
 prebuilt binary (the engine links Apple frameworks Zig can't cross-compile) — Mac
-users run the [Docker image](#-run-with-docker) via Docker Desktop, or build from
-source below.
+users build from source below.
 
 Those published binaries embed the **IHO S-101 Portrayal and Feature Catalogues**
 (compiled into libtile57 from the IHO's own GitHub repositories, which declare no
@@ -278,16 +248,8 @@ make vet        # go vet ./...
 make fmt        # gofmt -w .
 make serve      # build + serve web/ on :8080
 make xbuild     # cross-compile with `zig cc` (linux + windows, amd64/arm64)
-make musl       # fully-static musl binaries (linux amd64+arm64) for the Docker image
 ```
 
-The container image is built `FROM scratch` around the static musl binary (`make
-musl` / the [`Dockerfile`](Dockerfile)); the engine is git-cloned inside the
-builder, so no sibling checkout is needed to `docker build`. `zig cc`
-cross-compiles both arches from one native builder — no QEMU — and
-[`.github/workflows/docker.yml`](.github/workflows/docker.yml) pushes the
-multi-arch image to GHCR on each `v*` tag.
-
 CGO is required — libtile57 is the sole tile/portrayal engine, so
 `CGO_ENABLED=0` does not build. Cross-compilation still works with **Zig as the
 C toolchain** (`make xbuild` covers linux and windows; darwin must be built