fix: update Python command to use python3 in Dockerfile and entrypoint script

Author: ChristophShyper

Dockerfile

@@ -20,6 +20,6 @@ RUN chmod +x /entrypoint.sh ;\
   rm -rf /var/lib/apt/lists/*
 
 # Finish up
-CMD ["python", "--version"]
+CMD ["python3", "--version"]
 WORKDIR /github/workspace
 ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

@@ -6,7 +6,7 @@ set -e
 RET_CODE=0
 
 # Run main action
-python /terraform-copy-vars.py
+python3 /terraform-copy-vars.py
 RET_CODE=$?
 
 # List of changed files