fix dev.md and added minimal vanilla dockerfile

Author: evshvarov

Diff for: Dockerfile_vanilla

@@ -0,0 +1,13 @@
+FROM containers.intersystems.com/intersystems/iris-community:latest-preview
+
+RUN --mount=type=bind,src=.,dst=/home/irisowner/irislab <<EOT
+wget https://pm.community.intersystems.com/packages/zpm/latest/installer -O /tmp/zpm.xml
+iris start iris
+cat <<"EOF" | iris session iris -U %SYS
+do $system.OBJ.Load("/tmp/zpm.xml", "ck")
+Do ##class(Security.Users).UnExpireUserPasswords("*")
+zpm "load /home/irisowner/dev -v"
+halt
+EOF
+iris stop iris quietly
+EOT

Diff for: dev.md

@@ -101,3 +101,7 @@ USER root
 RUN apt update && apt-get -y install git
 
 USER ${ISC_PACKAGE_MGRUSER}
+
+
+## Python virtual environment
+python -m vevn .venv