ci: only have a single CI job and run it everywhere (#247)

Author: Stebalien

.github/workflows/check-main.yml

@@ -1,17 +1,16 @@
-name: Rust PR
+name: Continuous Integration
 
 on:
+  push:
+    branches:
+      - main
   pull_request:
-    # Default types for PR are opened, synchronize, reopened. Need
-    # ready_for_review to catch a PR that is moving from draft to not-draft
-    types: [opened, synchronize, reopened, ready_for_review]
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
   check-build:
-    if: github.event.pull_request.draft == false 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -20,7 +19,6 @@ jobs:
       - name: Build
         run: make check-build
   actor-tests:
-    if: github.event.pull_request.draft == false 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -29,7 +27,6 @@ jobs:
       - name: Test Actors
         run: make test-actors
   code-coverage:
-    if: github.event.pull_request.draft == false
     runs-on: ubuntu-latest
     steps:
     - name: Checkout