Mock (<= v6.6) relies on existing resolv.conf with --hermetic-build

Related: https://bugzilla.redhat.com/show_bug.cgi?id=2433808
Related: rpm-software-management/mock#1697
Closes: konflux-ci#118

Author: praiskup

Containerfile

@@ -41,4 +41,6 @@ RUN sed -i 's/# Note: These calls will alter the results of any subsequent macro
 # Assert utility versions
 RUN test "$(rpm --eval '%[ v"'"$(rpm -q --qf '%{VERSION}\n' mock)"'" >= v"6.4" ]')" = "1"
 
+ADD resolv.conf /etc/resolv.conf
+
 RUN grep sys.exit /usr/lib/python3.*/site-packages/rpmautospec/specparser.py

resolv.conf

@@ -0,0 +1,5 @@
+# This empty file is required for Mock to function correctly in modern Podman
+# with --network=none.  See these links for more information:
+# https://bugzilla.redhat.com/show_bug.cgi?id=2433808
+# rpm-software-management/mock#1697
+# https://github.com/konflux-ci/rpmbuild-pipeline-environment-container/pull/118