Revert "ci: remove nightly release"

This reverts commit 61bfaa9.

Author: imakira

.github/workflows/nightly_release.yaml

@@ -0,0 +1,48 @@
+name: nightly
+
+on:
+  schedule:
+    - cron: "13 15 * * *"
+jobs:
+  nightly_release:
+    environment: env
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Nix
+        uses: cachix/install-nix-action@v17
+        with:
+          extra_nix_config: |
+            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+
+      - name: Restore and save Nix store
+        uses: nix-community/cache-nix-action@v6
+        with:
+          # restore and save a cache using this key
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
+          # if there's no cache hit, restore a cache by this prefix
+          restore-prefixes-first-match: nix-${{ runner.os }}-
+          # collect garbage until the Nix store size (in bytes) is at most this number
+          # before trying to save a new cache
+          # 1G = 1073741824
+          gc-max-store-size-linux: 1G
+          # do purge caches
+          purge: true
+          # purge all versions of the cache
+          purge-prefixes: nix-${{ runner.os }}-
+          # created more than this number of seconds ago
+          purge-created: 0
+          # or last accessed this duration (ISO 8601 duration format)
+          # before the start of the `Post Restore and save Nix store` phase
+          purge-last-accessed: P1DT12H
+          # except any version with the key that is the same as the `primary-key`
+          purge-primary-key: never
+
+      - uses: actions/checkout@v6
+        with:
+          ref: master
+
+      - name: release
+        run: make ci-release-nightly
+        env:
+          CERULEAN_PASSPHRASE: ${{ secrets.CERULEAN_PASSPHRASE }}