Fixed an issue where psql of v12 throwing "symbol not found" error while running Maintenance and Import/Export.

Copy libpq.so.5.12 from pg12-builder to the final container and create a symbolic link. 

Fixes #4835

Dockerfile

@@ -166,6 +166,10 @@ RUN apk add --no-cache --virtual \
     pip install --no-cache-dir gunicorn && \
     apk del --no-cache build-deps
 
+# We need the v12 libpq, which is only in the 'edge' build of Alpine at present
+COPY --from=pg12-builder /usr/local/lib/libpq.so.5.12 /usr/lib/
+RUN ln -sf /usr/lib/libpq.so.5.12 /usr/lib/libpq.so.5
+
 # Copy the runner script
 COPY pkg/docker/run_pgadmin.py /pgadmin4
 COPY pkg/docker/entrypoint.sh /entrypoint.sh

docs/en_US/release_notes_4_15.rst

@@ -38,6 +38,7 @@ Bug fixes
 | `Issue #4730 <https://redmine.postgresql.org/issues/4730>`_ -  Ensure all messages are retained in the Query Tool from long running queries.
 | `Issue #4734 <https://redmine.postgresql.org/issues/4734>`_ -  Updated documentation for the delete row button that only strikeout the row instead of deleting it.
 | `Issue #4779 <https://redmine.postgresql.org/issues/4779>`_ -  Updated documentation for the query tool toolbar buttons.
+| `Issue #4835 <https://redmine.postgresql.org/issues/4835>`_ -  Fixed an issue where psql of v12 throwing "symbol not found" error while running Maintenance and Import/Export.
 | `Issue #4845 <https://redmine.postgresql.org/issues/4845>`_ -  Fixed potential error in the properties dialog for the Code tab.
 | `Issue #4850 <https://redmine.postgresql.org/issues/4850>`_ -  Fixed an issue where Datetimepicker control opens when clicking on the label.
 | `Issue #4895 <https://redmine.postgresql.org/issues/4895>`_ -  Fixed potential issue in reset function for nested objects.