add workflow for nightly. Doesn't work yet.

.github/workflows/nightly.yml

@@ -0,0 +1,28 @@
+---
+name: nightly
+on:
+# currently a manual snapshot release build instead of a nightly,
+#  as I haven't figured out yet how to prevent spamming the releases with no changes at all.
+#  schedule:
+    # * is a special character in YAML, so you have to quote this string
+    # doing builds Tue-Sat, so we have changes from Fri
+    # available already on Sat
+#    - cron:  '0 0 * * *'
+  workflow_dispatch:
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-go@v5
+        with:
+          go-version: 1.22
+      - name: Run goreleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: latest
+          args: release --snapshot --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}