Add dnf5-testing-nightly repository

.github/workflows/nightly.yml

@@ -15,11 +15,13 @@ jobs:
     strategy:
       fail-fast: false  # don't fail all matrix jobs if one of them fails
       matrix:
-        project: [dnf-nightly, dnf5-unstable]
+        project: [dnf-nightly, dnf5-unstable, dnf5-testing-nightly]
         variant: ['', -sanitizers]
         exclude:
           - project: dnf5-unstable
             variant: -sanitizers
+          - project: dnf5-testing-nightly
+            variant: -sanitizers
     steps:
       - name: Check out sources
         uses: actions/checkout@v2

overlays/dnf-testing-nightly/overlay.yml

@@ -0,0 +1,24 @@
+aliases:
+  - name: github
+    url: https://github.com/
+  - name: fedorapkgs
+    url: https://src.fedoraproject.org/rpms/
+  - name: centos-distgit
+    url: https://git.centos.org/rpms/
+
+components:
+
+  - name: libdnf
+    git:
+      src: github:rpm-software-management/libdnf.git
+      branch: origin/dnf-4-master
+
+  - name: dnf
+    git:
+      src: github:rpm-software-management/dnf.git
+    requires:
+      - libdnf
+
+  - name: dnf5
+    git:
+      src: github:rpm-software-management/dnf5.git