tree: Init DroneCI

Signed-off-by: Gagan Malvi <malvigagan@gmail.com>

.drone.yml

@@ -0,0 +1,20 @@
+--- 
+clone: 
+  depth: 1
+kind: pipeline
+name: EvaPipeline
+steps: 
+  - name: Kernel Pipeline
+    image: archlinux:base-devel
+    commands: 
+      - curl -fsSL "https://repo.archlinuxcn.org/x86_64/glibc-linux4-2.33-4-x86_64.pkg.tar.zst" | bsdtar -C / -xvf -
+      - pacman -Syu --needed --noconfirm wget base-devel xmlto inetutils bc cpio python-sphinx python-sphinx_rtd_theme graphviz imagemagick git python2 python zip
+      - export LANG=C && export LC_ALL=en_US.UTF-8
+      - "export token=$TOKEN"
+      - "bash build.sh"
+    environment: 
+      TOKEN: 
+        from_secret: token
+    trigger: 
+      branch:
+        - R