Build out all 27 modules + capstone (#1)

Co-authored-by: claude <[email protected]>
Co-committed-by: claude <[email protected]>

modules/16-containers-and-reproducible-environments/lab/dockerignore-starter

@@ -0,0 +1,22 @@
+# Copy this to a file named exactly ".dockerignore" in your project root.
+#
+# It does for the image what .gitignore (Module 2) does for the repo: what isn't copied can't
+# bloat the image, slow the build, or leak into it. A lean, predictable build context is part of
+# what makes the image reproducible.
+
+# Python caches — regenerated, never shipped
+__pycache__/
+*.pyc
+
+# Runtime state — never bake one machine's data into a shared image
+tasks.json
+
+# Version control and project meta — not needed to run the app
+.git/
+.gitignore
+.dockerignore
+
+# Local environments and docs — keep them out of the image
+.venv/
+venv/
+*.md