Update container and git ignore

Author: nhsd-david-wass

.gitignore

@@ -27,3 +27,4 @@ dist
 /sandbox/*.log
 /sandbox-staging
 /specification/api/components/examples
+/scripts/JWT/*.pem

scripts/devcontainer/postcreatecommand.sh

@@ -8,6 +8,8 @@ source ~/.zshrc
 make _install-dependencies # required before config to ensure python is available due to race between config:: make targets
 make config
 
+pip install --user requests pyjwt cryptography
+
 sudo gem install jekyll bundler
 jekyll --version && cd docs && bundle install