Initial commit

Assisted-by: GLM 5.3

.gitea/workflows/race.yml

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+# Race, Go. Dispatched by hand.
+#
+# The race detector roughly doubles both time and memory, which the shared runner box
+# cannot afford on a push, and it is not part of a release either: locally it belongs to
+# `just gates`, which races the tree before the tag is cut. Here it is an explicit
+# decision rather than a routine.
+#
+# Every step is one command, so the step that fails is the gate that failed.
+name: Race
+
+on:
+  workflow_dispatch:
+
+env:
+  # interpres is fetched directly from the self-hosted Gitea, not via
+  # proxy.golang.org, and skips the public checksum database.
+  GOPRIVATE: sourcedock.dev
+  # One core: parallelism buys no speed here and costs memory the box does not have.
+  GOFLAGS: -p=1
+  GOMAXPROCS: "2"
+
+jobs:
+  race:
+    runs-on: fedora
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Install gcc
+        # The race detector needs cgo and the runner image carries no C compiler.
+        run: dnf install -y gcc
+
+      - name: Race
+        run: go test -race -count=1 -timeout 10m ./...