Reduce unnecessary GitHub Actions usage

.github/workflows/ci.yml

@@ -1,10 +1,13 @@
 name: CI
 
 on:
-  push:
-    branches: [main]
   pull_request:
     branches: [main]
+  workflow_dispatch:
+
+concurrency:
+  group: ci-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 
 env:
   CARGO_TERM_COLOR: always
@@ -40,7 +43,3 @@ jobs:
 
       - name: Build (release)
         run: cargo build --release --verbose
-
-  linux-i686:
-    name: Build & Test Linux i686
-    uses: ./.github/workflows/build-i686.yml

.github/workflows/release.yml

@@ -39,7 +39,6 @@ permissions:
 # If there's a prerelease-style suffix to the version, then the release(s)
 # will be marked as a prerelease.
 on:
-  pull_request:
   push:
     tags:
       - '**[0-9]+.[0-9]+.[0-9]+*'

RELEASING.md

@@ -24,6 +24,11 @@ Termleaf follows Semantic Versioning:
 
 5. Commit and push the release preparation, then confirm the normal CI passed.
 
+To conserve GitHub Actions usage, normal CI runs once per pull request and
+cancels superseded runs. The i686 compatibility build and cargo-dist platform
+matrix run only for version-tag releases; validate i686-sensitive changes
+locally before tagging when possible.
+
 ## Publish
 
 Create and push a tag that exactly matches the Cargo package version:

dist-workspace.toml

@@ -4,6 +4,7 @@ members = ["cargo:."]
 [dist]
 cargo-dist-version = "0.32.0"
 ci = "github"
+pr-run-mode = "skip"
 installers = []
 targets = [
     "aarch64-apple-darwin",