chore: refactor into reusable workflows

Signed-off-by: Sam Gammon <[email protected]>

.github/workflows/ci.yml

@@ -1,12 +1,8 @@
 name: CI
 
 on:
-  push:
-    branches:
-      - master
-  pull_request:
-    branches:
-      - master
+  workflow_call: {}
+  workflow_dispatch: {}
 
 permissions:
   contents: read

.github/workflows/on.pr.yml

@@ -0,0 +1,25 @@
+name: PR
+
+on:
+  pull_request:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  ## Run main CI build and tests.
+  run-ci:
+    name: "Build & Test"
+    uses: ./.github/workflows/ci.yml
+
+  ## Publish and check the dependency graph.
+  checks-dependency-graph:
+    name: "Checks"
+    uses: ./.github/workflows/dependency-review.yml
+
+  ## Run CodeQL checks
+  checks-codeql:
+    name: "Checks"
+    uses: ./.github/workflows/codeql.yml

.github/workflows/on.push.yml

@@ -0,0 +1,25 @@
+name: Push
+
+on:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  ## Run main CI build and tests.
+  run-ci:
+    name: "Build & Test"
+    uses: ./.github/workflows/ci.yml
+
+  ## Publish and check the dependency graph.
+  checks-dependency-graph:
+    name: "Checks"
+    uses: ./.github/workflows/dependency-review.yml
+
+  ## Run CodeQL checks
+  checks-codeql:
+    name: "Checks"
+    uses: ./.github/workflows/codeql.yml