Drop Drone PR & push tests

Tests are now executed by GitHub Actions. Drone
tests are still executed on releases since these
are still a Drone's responsibility.

Author: anatoliykmetyuk

.drone.yml

@@ -33,6 +33,11 @@ steps:
   - cp -R . /tmp/1/ && cd /tmp/1/
   - ./project/scripts/sbt ";compile ;test"
   - ./project/scripts/cmdTests
+  when:
+    event:
+    - tag
+    - promote
+
 
 - name: test_bootstrapped
   pull: default
@@ -42,6 +47,10 @@ steps:
   - cp -R . /tmp/2/ && cd /tmp/2/
   - ./project/scripts/sbt ";dotty-bootstrapped/compile ;dotty-bootstrapped/test;sjsSandbox/run;sjsSandbox/test;sjsJUnitTests/test ;configureIDE"
   - ./project/scripts/bootstrapCmdTests
+  when:
+    event:
+    - tag
+    - promote
 
 - name: community_build
   pull: default
@@ -52,6 +61,10 @@ steps:
   - git submodule sync
   - git submodule update --init --recursive --jobs 7
   - ./project/scripts/sbt community-build/test
+  when:
+    event:
+    - tag
+    - promote
 
 - name: test_sbt
   pull: default

README.md

@@ -1,6 +1,5 @@
 Dotty
 =====
-[![Build Status](http://dotty-ci.epfl.ch/api/badges/lampepfl/dotty/status.svg)](http://dotty-ci.epfl.ch/lampepfl/dotty)
 [![Dotty CI](https://github.com/lampepfl/dotty/workflows/Dotty%20CI/badge.svg?branch=master)](https://github.com/lampepfl/dotty/actions?query=branch%3Amaster)
 [![Join the chat at https://gitter.im/lampepfl/dotty](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/lampepfl/dotty?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Log Knowledge](https://img.shields.io/badge/log-knowledge-blueviolet.svg)](https://github.com/lampepfl/dotty-knowledge/issues/new/choose)