ci: Persist build logs

ci/Jenkinsfile

@@ -53,5 +53,14 @@ pipeline {
                 }
             }
         }
+
+    }
+
+    post {
+        failure {
+            dir('tmp/portage') {
+                archiveArtifacts '*/*/temp/*.log'
+            }
+        }
     }
 }

lib/common.sh

@@ -6,10 +6,11 @@ buildah_run_script() {
     shift
     script=$(readlink -f "$1")
     shift
-    mkdir -p binpkgs
+    mkdir -p binpkgs tmp
     buildah run \
         --mount type=cache,target=/var/db/repos/gentoo \
         --mount type=cache,target=/var/cache \
+        --mount type=bind,src="${PWD}"/tmp,target=/var/tmp,rw,z \
         --mount type=bind,src="${PWD}"/binpkgs,target=/var/cache/binpkgs,rw,z \
         --mount type=bind,src="${script}",target=/run/script,ro,z \
         --tty=false \