oss/exe-scroll: build release artifacts in CI, versioned by commit count

Add a release-exe-scroll job to the oss repo's test workflow that, on
push to main, runs exe-scroll/release.sh: it computes a tag of the form
exe-scroll/v0.<count>.9<sha-octal> (count = commits touching
exe-scroll/, same scheme as the existing Go-module auto-tag job and
Shelley's releases), cross-builds static musl binaries for amd64/arm64
via the existing build-static.sh, pushes the tag, and publishes a
GitHub release with exe-scroll-linux-{amd64,arm64}.

The workflow YAML stays minimal; all logic lives in the checked-in
release.sh. The script is idempotent: it skips when exe-scroll/ is
unchanged since the latest *released* tag, and a re-run recovers if a
previous run pushed the tag but died before publishing the release.

Prompt: Can you make it so that the oss repo (that's a subdir of this
repo) ends up building exe-scroll release artifacts versioned by the
number of commits in the dir or something like that. Shelley does a
similar thing. Simple is best. Don't write shell scripts in yaml;
minimal yaml is best

Co-authored-by: Shelley <shelley@exe.dev>

Author: philz

.github/workflows/test.yml

@@ -57,3 +57,22 @@ jobs:
             git tag -a "$TAG" -m "Auto-tag $module at ${SHORT_SHA}"
             git push origin "$TAG"
           done
+
+  release-exe-scroll:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+    concurrency:
+      group: release-exe-scroll
+      cancel-in-progress: false
+    permissions:
+      contents: write
+    needs: test
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Build and release exe-scroll
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: exe-scroll/release.sh

exe-scroll/.gitignore

@@ -2,3 +2,4 @@
 /.zig-cache
 /ghostty-src
 /.ghostty
+/dist

exe-scroll/release.sh

@@ -0,0 +1,56 @@
+#!/bin/sh
+# Tag and release exe-scroll from CI (see .github/workflows/test.yml).
+#
+# Versioned by the number of commits touching exe-scroll/, matching the Go
+# module auto-tagging scheme in test.yml: exe-scroll/v0.<count>.9<sha-octal>.
+# Skips (exit 0) when exe-scroll/ is unchanged since the latest release tag.
+#
+# Requires: full git history + tags (actions/checkout fetch-depth: 0), gh CLI
+# with GH_TOKEN, and push access to tags (permissions: contents: write).
+set -e
+
+SRC_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+cd "$SRC_DIR/.."
+
+# Skip when exe-scroll/ is unchanged since the latest released tag. Both
+# conditions matter: checking the release (not just the tag) lets a re-run
+# recover if a previous run pushed the tag but died before publishing.
+LATEST=$(git tag -l 'exe-scroll/v*' --sort=-v:refname | head -1)
+if [ -n "$LATEST" ] && git diff --quiet "$LATEST" -- exe-scroll/ &&
+    gh release view "$LATEST" >/dev/null 2>&1; then
+    echo "exe-scroll unchanged since released $LATEST; nothing to release."
+    exit 0
+fi
+
+COUNT=$(git rev-list --count HEAD -- exe-scroll/)
+SHORT_SHA=$(git rev-parse --short=6 HEAD)
+SHA_OCTAL=$(printf '%o' "0x${SHORT_SHA}")
+TAG="exe-scroll/v0.${COUNT}.9${SHA_OCTAL}"
+
+# Key idempotency on the release, not the tag: if a previous run pushed the
+# tag but died before creating the release, a re-run still finishes the job.
+if gh release view "$TAG" >/dev/null 2>&1; then
+    echo "release $TAG already exists; nothing to release."
+    exit 0
+fi
+
+echo "Releasing $TAG"
+
+DIST="$SRC_DIR/dist"
+rm -rf "$DIST"
+for arch in amd64 arm64; do
+    OUT_DIR="$DIST/$arch" "$SRC_DIR/build-static.sh" "$arch"
+    cp "$DIST/$arch/bin/exe-scroll" "$DIST/exe-scroll-linux-$arch"
+done
+
+if ! git rev-parse -q --verify "refs/tags/$TAG" >/dev/null; then
+    git config user.name "github-actions[bot]"
+    git config user.email "github-actions[bot]@users.noreply.github.com"
+    git tag -a "$TAG" -m "exe-scroll release $TAG (${SHORT_SHA})"
+    git push origin "$TAG"
+fi
+
+gh release create "$TAG" \
+    --title "$TAG" \
+    --notes "Static musl builds of exe-scroll at ${SHORT_SHA}." \
+    "$DIST"/exe-scroll-linux-*