ci: add nightly build and release

Author: yuchanns

.github/workflows/nightly.yml

@@ -8,6 +8,8 @@ on:
     branches:
       - master
   workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * *'  # Runs every day at midnight UTC
 
 jobs:
   build:
@@ -64,8 +66,128 @@ jobs:
           echo "SOLUNA_BINARY=$SOLUNA_BINARY" >> $GITHUB_OUTPUT
       - uses: actions/upload-artifact@v4
         name: Upload
+        if: github.event_name == 'workflow_dispatch' || github.event_name == 'schedule'
         with:
           name: "soluna-${{ runner.os }}-${{ steps.build.outputs.SOLUNA_BINARY }}"
           if-no-files-found: "error"
           path: "${{ steps.build.outputs.SOLUNA_PATH }}"
           overwrite: "true"
+  release:
+    name: Create Nightly Release
+    needs: build
+    runs-on: ubuntu-latest
+    if: github.event_name == 'workflow_dispatch' || github.event_name == 'schedule'
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v5
+      - name: Download all artifacts
+        uses: actions/download-artifact@v5
+        with:
+          path: artifacts
+      - name: Prepare release assets
+        run: |
+          mkdir -p release-assets
+          find artifacts -type f -name "soluna*" -exec cp {} release-assets/ \;
+          ls -la release-assets/
+      - name: Delete existing nightly releases
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const releases = await github.rest.repos.listReleases({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              per_page: 100
+            });
+            
+            for (const release of releases.data) {
+              if (release.tag_name.includes('nightly') || release.name.includes('Nightly')) {
+                console.log(`Deleting release: ${release.tag_name}`);
+                try {
+                  await github.rest.repos.deleteRelease({
+                    owner: context.repo.owner,
+                    repo: context.repo.repo,
+                    release_id: release.id
+                  });
+                  
+                  try {
+                    await github.rest.git.deleteRef({
+                      owner: context.repo.owner,
+                      repo: context.repo.repo,
+                      ref: `tags/${release.tag_name}`
+                    });
+                  } catch (error) {
+                    console.log(`Tag ${release.tag_name} might not exist or already deleted`);
+                  }
+                } catch (error) {
+                  console.log(`Failed to delete release ${release.tag_name}: ${error.message}`);
+                }
+              }
+            }
+      - name: Create nightly release
+        id: create-release
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, -5);
+            const commitSha = context.sha.substring(0, 7);
+            const tagName = 'nightly';
+            const releaseNotes = `🌙 **Nightly Build**
+
+            **Build Information:**
+            - **Commit:** \`${context.sha}\`
+            - **Branch:** \`${context.ref.replace('refs/heads/', '')}\`
+            - **Build Time:** \`${new Date().toISOString()}\`
+            - **Workflow:** [${context.runId}](${context.serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId})
+
+            **Assets:**
+            - soluna-Windows-soluna.exe
+            - soluna-macOS-soluna
+
+            > ⚠️ **Note:** This is an automated nightly build. It may contain unstable features and bugs.
+            > 
+            > 📦 **Previous nightly releases are automatically removed to keep the repository clean.`;
+            
+            const { data } = await github.rest.repos.createRelease({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              tag_name: tagName,
+              name: `Nightly Build (${timestamp})`,
+              body: releaseNotes,
+              prerelease: true,
+              make_latest: 'false'
+            });
+            
+            console.log(`Created release: ${data.html_url}`);
+            return data.id;
+      - name: Upload release assets
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const path = require('path');
+            const releaseId = ${{ steps.create-release.outputs.result }};
+            
+            const assetsDir = 'release-assets';
+            const files = fs.readdirSync(assetsDir);
+            
+            for (const file of files) {
+              const filePath = path.join(assetsDir, file);
+              const stats = fs.statSync(filePath);
+              
+              if (stats.isFile()) {
+                console.log(`Uploading ${file}...`);
+                
+                const content = fs.readFileSync(filePath);
+                
+                await github.rest.repos.uploadReleaseAsset({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  release_id: releaseId,
+                  name: file,
+                  data: content
+                });
+                
+                console.log(`✅ Uploaded ${file}`);
+              }
+            }