Add focal building

.drone.yml

@@ -36,6 +36,23 @@ steps:
       - cp ../tinc*.deb /deb_files/buster/
       - find /deb_files/
 
+  - name: Build Ubuntu Focal
+    image: ubuntu:focal
+    volumes:
+      - name: finished_files
+        path: /deb_files
+    commands:
+      - apt update
+      - apt -y upgrade
+      - apt -y install --no-install-recommends build-essential equivs devscripts git rename
+      - git clean -f -d -x
+      - mk-build-deps --install --tool='apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends --yes' debian/control
+      - dpkg-buildpackage -b -uc
+      - rename 's/\.deb/_focal\.deb/' ../*.deb
+      - mkdir -p /deb_files/focal/
+      - cp ../tinc*.deb /deb_files/focal/
+      - find /deb_files/
+
   - name: gitea_release
     image: plugins/gitea-release
     volumes:
@@ -48,6 +65,7 @@ steps:
       files: 
         - /deb_files/buster/*
         - /deb_files/bullseye/*
+        - /deb_files/focal/*
     when:
       event: tag