GHA: add i386 atomicalign

Inspo from github.com/IBM/sarama/pull/2874 (MIT)

Author: twmb

.github/workflows/i386.yml

@@ -0,0 +1,30 @@
+# Inspired by github.com/IBM/sarama/pull/2874 (MIT)
+
+name: i386
+
+on:
+  push:
+    branches: ["*"]
+    paths-ignore:
+      - '**/*.md'
+  pull_request:
+    branches: ["*"]
+    paths-ignore:
+      - '**/*.md'
+
+jobs:
+  atomicalign:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v4
+        with:
+          go-version: 'stable'
+      - name: staticcheck
+        env:
+          GOARCH: 386
+          GOFLAGS: -tags=functional
+        run: |
+            git clone --depth=1 https://github.com/dominikh/go-tools /tmp/go-tools
+            ( cd /tmp/go-tools/cmd/staticcheck && go build -o /tmp/staticcheck )
+            /tmp/staticcheck -checks SA1027 ./...