Keep git-ignored files and data/ out of the Docker build context (closes #266)

.dockerignore now lists every .gitignore pattern, each with **/ so Docker
matches it in every directory as git does, plus the top-level data/
directory. git-ignored secrets such as .env.local, *.key files and
data/session.key no longer reach the build stages or the build cache. A last
!.git/** line sends all of .git again, since git never applies these patterns
inside it, so a branch named like fix/session.key still resolves. No tracked
file is listed, so the version still comes from git describe without -dirty.

data/, where upaasd keeps its database and session key when run from the
checkout, is now git-ignored.

Model: opus-5-5

.dockerignore

@@ -1,11 +1,35 @@
 # .git is sent so that `make build` in the Dockerfile can stamp the commit into
 # upaas. List no tracked file here: git would see it as deleted in the build and
 # the version would end in -dirty.
+
+# The patterns of .gitignore; **/ makes Docker match them in every directory.
+**/.DS_Store
+**/Thumbs.db
+**/*.swp
+**/*.swo
+**/*~
+**/*.bak
+**/.idea/
+**/.vscode/
+**/*.sublime-*
+**/node_modules/
+**/.env
+**/.env.*
+**/*.pem
+**/*.key
+**/bin/
+**/*.exe
+**/*.exe~
+**/*.dll
+**/*.so
+**/*.dylib
+**/*.test
+**/*.out
+/data/
+
+# Git never applies its ignore patterns inside .git; send all of it again.
+!.git/**
+
 # .git is sent without its config, because a remote URL there can carry a
-# credential; `git describe` does not need it.
+# credential; `git describe` does not need it. Keep this after !.git/**.
 .git/config
-.env
-bin/
-.vscode/
-.idea/
-*.test

.gitignore

@@ -1,3 +1,5 @@
+# .dockerignore repeats these patterns; change both together.
+
 # OS
 .DS_Store
 Thumbs.db
@@ -29,3 +31,6 @@ bin/
 *.dylib
 *.test
 *.out
+
+# upaasd's data directory when it runs from the checkout (UPAAS_DATA_DIR default)
+/data/

TODO.md

@@ -20,6 +20,11 @@ regress.
 
 # Completed Steps
 
+- 2026-10-02: `docker build .` no longer sends git-ignored files, such as
+  `.env.local`, `*.key` files or upaasd's `data/` directory with its session
+  key, into the build stages and the build cache: `.dockerignore` now leaves out
+  everything `.gitignore` does, and `data/` is git-ignored (#266).
+
 - 2026-10-02: `.dockerignore` leaves out `.git/config`, so a remote URL there
   that carries a credential no longer goes into the Docker build; the image
   still shows the commit it was built from (#269).