[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/release-nightly.yml

@@ -0,0 +1,49 @@
+name: Release (nightly)
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - "**.py"
+      - "!yt_dlp/version.py"
+concurrency:
+  group: release-nightly
+  cancel-in-progress: true
+permissions:
+  contents: read
+
+jobs:
+  prepare:
+    if: vars.BUILD_NIGHTLY != ''
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.get_version.outputs.version }}
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Get version
+        id: get_version
+        run: |
+          python devscripts/update-version.py "$(date -u +"%H%M%S")" | grep -Po "version=\d+(\.\d+){3}" >> "$GITHUB_OUTPUT"
+
+  build:
+    needs: prepare
+    uses: ./.github/workflows/build.yml
+    with:
+      version: ${{ needs.prepare.outputs.version }}
+      channel: nightly
+    permissions:
+      contents: read
+      packages: write # For package cache
+
+  publish:
+    needs: [prepare, build]
+    uses: ./.github/workflows/publish.yml
+    secrets:
+      ARCHIVE_REPO_TOKEN: ${{ secrets.ARCHIVE_REPO_TOKEN }}
+    permissions:
+      contents: write
+    with:
+      nightly: true
+      version: ${{ needs.prepare.outputs.version }}
+      target_commitish: ${{ github.sha }}