ci: fixes to several weekly spread tests (#2032)

This doesn't resolve all the issues, but it's a start.

.github/workflows/spread-large.yaml

@@ -10,6 +10,9 @@ on:
   pull_request:
     paths:
       - .github/workflows/spread-large.yaml
+      - tests/spread/charms/**
+      - tests/spread/smoketests/parallel-build/*
+      - tests/spread/smoketests/remote-build/*
 
 # Only ever run one of this test at a time.
 concurrency:

tests/spread/charms/k8s-operator/task.yaml

@@ -16,7 +16,8 @@ environment:
   CHARM/kafka: https://github.com/canonical/kafka-k8s-operator
   CHARM/loki: https://github.com/canonical/loki-k8s-operator
   CHARM/mattermost: https://git.launchpad.net/charm-k8s-mattermost
-  CHARM/mongodb: https://github.com/canonical/mongodb-k8s-operator
+  # Uses tox, needs a different workflow right now.
+  # CHARM/mongodb: https://github.com/canonical/mongodb-k8s-operator
   # Uses tox, needs a different workflow right now.
   # CHARM/mysql: https://github.com/canonical/mysql-k8s-operator
   CHARM/pgbouncer: https://github.com/canonical/pgbouncer-k8s-operator

tests/spread/charms/reactive/task.yaml

@@ -27,5 +27,6 @@ execute: |
   cd charm
   charmcraft pack --verbose
 
+  rm ~/*.charm
   mv *.charm ~/
-  juju deploy ~/20.04-amd64.charm
+  juju deploy ~/*.charm