add apptainer def and update gitignore

.gitignore

@@ -1,4 +1,5 @@
 *~
+*.sif
 debug/
 target/
 python/foundation/_*

INSTALL.md

@@ -31,14 +31,13 @@ pip install polars
 > https://github.com/rust-lang/rust-clippy
 
 > apptainer / singularity
-> https://apptainer.org/docs/user/main/quick_start.html#downloading-images
+https://apptainer.org/docs/user/latest/quick_start.html
 
 > pytest
 > https://docs.pytest.org/en/7.4.x/how-to/fixtures.html
 pip install pytest
 
-> pytest-cov
+> pytest-cov, sphinx, line_profiler
 pip install pytest-cov
-
-> sphinx
 pip install sphinx
+pip install line_profiler

containers/foundation/foundation.def

@@ -0,0 +1,16 @@
+BootStrap: docker
+From: ubuntu:22.04
+
+%post
+   apt-get -y update
+   apt-get -y install cowsay lolcat
+
+%environment
+   export LC_ALL=C
+   export PATH=/usr/games:$PATH
+
+%runscript
+   date | cowsay | lolcat
+
+%labels
+   Example Author