feat(ci): Run once a week

So CI backend changes don't sneak up on us next time we want to actually do something

.github/workflows/ci.yaml

@@ -0,0 +1,10 @@
+name: Continuous Testing
+
+on:
+  # Run once a week, so we CI backend updates don't sneak up on us
+  schedule:
+    - cron: "0 13 * * SUN"
+
+jobs:
+  test:
+    uses: ./.github/workflows/test.yaml

.github/workflows/commit.yaml

@@ -0,0 +1,10 @@
+name: Commit Testing
+
+on:
+  push:
+    branches-ignore:
+      - master
+
+jobs:
+  call-test:
+    uses: ./.github/workflows/test.yaml

.github/workflows/test.yaml

@@ -1,7 +1,7 @@
 name: Test
 
 on:
-  push:
+  workflow_call:
 
 jobs:
   linux: