ci: improve workflow triggers (#2017)

- Unchain commit-lint and CI
  - Even if a commit does not meet the CI path filter, it still needs to lint the commit message.
- Unchain PR filter and CI
  - The CI workflow needs to be triggered when the commits in a pull request are modified.
- Allow manual publishing
  - Sometimes `semantic-release` will error out due to commit messages referencing discussions, but this does not affect the final RubyGems/GitHub Release. In such cases, manual triggering of the publish process is needed to complete the remaining publishing steps.

.github/workflows/ci.yml

@@ -1,18 +1,25 @@
-name: "CI"
+name: CI
 
 on:
   push:
     branches:
-      - "master"
-      - "hotfix/**"
+      - master
+      - "hotfix/*"
     paths-ignore:
       - ".github/**"
       - "!.github/workflows/ci.yml"
-      - ".gitignore"
+      - .gitignore
       - "docs/**"
-      - "README.md"
-      - "LICENSE"
-  workflow_call:
+      - README.md
+      - LICENSE
+  pull_request:
+    paths-ignore:
+      - ".github/**"
+      - "!.github/workflows/ci.yml"
+      - .gitignore
+      - "docs/**"
+      - README.md
+      - LICENSE
 
 jobs:
   build:
@@ -44,7 +51,3 @@ jobs:
 
       - name: Test Site
         run: bash tools/test.sh
-
-  check-commit:
-    needs: build
-    uses: ./.github/workflows/commitlint.yml