added recursive git cloning

+apt update

.drone.yml

@@ -0,0 +1,67 @@
+kind: pipeline
+type: docker
+name: amd64-pull
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: submodules
+  image: ubuntu:focal
+  commands:
+  - apt-get -y update
+  - apt-get -y install git
+  - git submodule update --init --recursive
+
+- name: build-and-test
+  image: ubuntu:focal
+
+  commands:
+  - export DEBIAN_FRONTEND=noninteractive
+  - apt-get -y update
+  - apt-get -y install graphviz plantuml make python3-pip git
+  - pip install -r requirements.txt
+  - make bundle
+
+trigger:
+  branch:
+  - main
+  event:
+  - pull_request
+
+---
+kind: pipeline
+type: docker
+name: amd64-master
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: submodules
+  image: ubuntu:focal
+  commands:
+  - apt-get -y update
+  - apt-get -y install git
+  - git submodule update --init --recursive
+
+- name: build-and-test
+  image: ubuntu:focal
+
+  commands:
+  - export DEBIAN_FRONTEND=noninteractive
+  - export DRONE_BUILD_DIR=$PWD
+  - apt-get -y update
+  - apt-get -y install graphviz plantuml make python3 python3-pip git
+  - pip install -r requirements.txt
+  - make -j4 bundle
+
+trigger:
+  branch:
+  - master
+  event:
+  - push
+
+