[build] Automated builds and nightly releases (#6220)

Closes #1839
Authored by: Grub4K, bashonly

Co-authored-by: bashonly <88596187+bashonly@users.noreply.github.com>

.github/workflows/publish.yml

@@ -0,0 +1,80 @@
+name: Publish
+on:
+  workflow_call:
+    inputs:
+      nightly:
+        default: false
+        required: false
+        type: boolean
+      version:
+        required: true
+        type: string
+      target_commitish:
+        required: true
+        type: string
+    secrets:
+      ARCHIVE_REPO_TOKEN:
+        required: false
+
+permissions:
+  contents: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: actions/download-artifact@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+
+      - name: Generate release notes
+        run: |
+          cat >> ./RELEASE_NOTES << EOF
+          #### A description of the various files are in the [README](https://github.com/yt-dlp/yt-dlp#release-files)
+          ---
+          <details><summary><h3>Changelog</h3></summary>
+          $(python ./devscripts/make_changelog.py -vv)
+          </details>
+          EOF
+          echo "**This is an automated nightly pre-release build**" >> ./PRERELEASE_NOTES
+          cat ./RELEASE_NOTES >> ./PRERELEASE_NOTES
+          echo "Generated from: https://github.com/${{ github.repository }}/commit/${{ inputs.target_commitish }}" >> ./ARCHIVE_NOTES
+          cat ./RELEASE_NOTES >> ./ARCHIVE_NOTES
+
+      - name: Archive nightly release
+        env:
+          GH_TOKEN: ${{ secrets.ARCHIVE_REPO_TOKEN }}
+          GH_REPO: ${{ vars.ARCHIVE_REPO }}
+        if: |
+          inputs.nightly && env.GH_TOKEN != '' && env.GH_REPO != ''
+        run: |
+          gh release create \
+            --notes-file ARCHIVE_NOTES \
+            --title "Build ${{ inputs.version }}" \
+            ${{ inputs.version }} \
+            artifact/*
+
+      - name: Prune old nightly release
+        if: inputs.nightly
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh release delete --yes --cleanup-tag "nightly" || true
+          git tag --delete "nightly" || true
+          sleep 5  # Enough time to cover deletion race condition
+
+      - name: Publish release${{ inputs.nightly && ' (nightly)' || '' }}
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh release create \
+            --notes-file ${{ inputs.nightly && 'PRE' || '' }}RELEASE_NOTES \
+            --target ${{ inputs.target_commitish }} \
+            --title "yt-dlp ${{ inputs.nightly && 'nightly ' || '' }}${{ inputs.version }}" \
+            ${{ inputs.nightly && '--prerelease "nightly"' || inputs.version }} \
+            artifact/*