[FIX] Odoo 11.0-13.0: remove postgres source list after usage

When installing postgresql-client, the Debian repo from Postgresql is added as a source list.
As a consequence, when installing the Odoo debian packages, the
package dependencies are also searched in the Postgresql repo.

In this case, it appears that python3-werkzeug version 0.16 was
installed from the Postgresql repo.

Closes #299

11.0/Dockerfile

@@ -48,6 +48,7 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > /etc
         && rm -rf "$GNUPGHOME" \
         && apt-get update  \
         && apt-get install --no-install-recommends -y postgresql-client \
+        && rm -f /etc/apt/sources.list.d/pgdg.list \
         && rm -rf /var/lib/apt/lists/*
 
 # Install Odoo

12.0/Dockerfile

@@ -48,6 +48,7 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ stretch-pgdg main' > /etc
         && rm -rf "$GNUPGHOME" \
         && apt-get update  \
         && apt-get install --no-install-recommends -y postgresql-client \
+        && rm -f /etc/apt/sources.list.d/pgdg.list \
         && rm -rf /var/lib/apt/lists/*
 
 # Install rtlcss (on Debian stretch)

13.0/Dockerfile

@@ -46,6 +46,7 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' > /etc/
         && rm -rf "$GNUPGHOME" \
         && apt-get update  \
         && apt-get install --no-install-recommends -y postgresql-client \
+        && rm -f /etc/apt/sources.list.d/pgdg.list \
         && rm -rf /var/lib/apt/lists/*
 
 # Install rtlcss (on Debian buster)