Docker: a build context that isn't 3.6GB, and health you can see

The all-in-one image builds from the project root, and Docker only reads
.dockerignore from the context root — so the ones under "API Server" and
"Web App" never applied to it and every AIO build shipped the whole tree,
"Phone App/build" included. A root .dockerignore allow-lists the paths that
build actually copies.

The dev split stack passed neither PB_BOOTSTRAP nor the SUPERADMIN vars, so
it created the schema and then no user to log in with. It passes them now,
and .env.example says so.

WEBAPP_URL was never set anywhere, leaving the panel status page probing
localhost:8090 — itself — and always reporting the Web App as down. Each
compose file now points it at wherever the Web App really is, and the BFF
grew a real /healthz instead of letting the SPA fallback answer probes with
index.html and look healthy no matter what.

In the AIO, PocketBase and the API Server drop to an unprivileged user;
only nginx stays root to bind :80. The entrypoint takes ownership of the
two volumes first, so data written by the old root-only image stays
writable. All three images carry a HEALTHCHECK, every compose file declares
one too (so depends_on still gates against an older pulled image), and
web-app waits for the API Server to be serving rather than merely started.

Also: pinned alpine/golang/node and PocketBase 0.39.11, so a rebuild months
from now produces the same image; nginx forwards WebSocket upgrades instead
of stripping them, with the map in http.d where Alpine actually reads it;
and a .gitattributes keeps entrypoint.sh on LF, because a CRLF shebang from
a Windows clone fails at container start with "no such file or directory".

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitattributes

@@ -0,0 +1,15 @@
+# Default: let Git normalise text in the repository and check it out natively.
+* text=auto
+
+# Anything that ends up inside a Linux container must keep LF endings. This repo
+# is developed on Windows with core.autocrlf=true, so without these rules a
+# fresh clone would give entrypoint.sh a CRLF shebang (#!/bin/sh\r), which the
+# kernel rejects with a confusing "no such file or directory" at container start.
+# Dockerfiles matter too: their heredocs write the scripts and configs above.
+*.sh            text eol=lf
+Dockerfile      text eol=lf
+*.dockerfile    text eol=lf
+.dockerignore   text eol=lf
+docker-compose*.yml text eol=lf
+*.env.example   text eol=lf
+.env.example    text eol=lf