[IMP] runbot: add default env variable in docker image

Author: Xavier-Do

runbot/data/dockerfile_data.xml

@@ -168,6 +168,14 @@ RUN deluser ubuntu</field>
         <field name="content">USER {USERNAME}</field>
     </record>
 
+    <record id="runbot.docker_layer_odoo_runbot" model="runbot.docker_layer">
+        <field name="sequence" eval="1030"/>
+        <field name="dockerfile_id" ref="runbot.docker_default"/>
+        <field name="layer_type">raw</field>
+        <field name="name">ENV ODOO_RUNBOT 1</field>
+        <field name="content">ENV ODOO_RUNBOT 1</field>
+    </record>
+
     <record id="runbot.docker_pip_break_system_packages" model="runbot.docker_layer">
         <field name="sequence" eval="1100"/>
         <field name="dockerfile_id" ref="runbot.docker_default"/>

runbot/tests/test_dockerfile.py

@@ -68,6 +68,7 @@ def test_docker_default(self):
 RUN deluser ubuntu
 RUN groupadd -g 1337 TestUser && useradd --create-home -u 4242 -g TestUser -G audio,video TestUser
 USER TestUser
+ENV ODOO_RUNBOT 1
 ENV PIP_BREAK_SYSTEM_PACKAGES=1
 RUN python3 -m pip install --no-cache-dir ebaysdk==2.1.5 pdf417gen==0.7.1
 ADD --chown=TestUser https://raw.githubusercontent.com/odoo/odoo/master/requirements.txt /tmp/requirements.txt