Resolve "python_syntax is python2 only"

Closes #48 (closed)

ci-templates/auto-rules/no-default.yml

@@ -49,7 +49,8 @@ industrial_ci_humble:
     - if: $DEFAULT_DISTRO == "humble"
     - if: $BUILD_HUMBLE
 
-.py3_template:
+py3_template:
+  extends: .py3_template
   rules:
     - if: $DEFAULT_DISTRO == "noetic"
       when: always
@@ -61,7 +62,8 @@ industrial_ci_humble:
       when: always
   when: always
 
-.py2_template:
+py2_template:
+  extends: .py2_template
   rules:
     - if: $DEFAULT_DISTRO == "kinetic"
       when: always