Build fix (#1613)

* Changed build environment linux distribution
* Changed jdk in build script
* JDK switcher does not work, try to set it as an configuration attribute. Only execute deploy scripts on winders repository.

.travis.yml

@@ -1,6 +1,7 @@
-dist: trusty
+dist: focal
 language: java
 os: linux
+jdk: openjdk13
 
 # Prevent running default install script
 install: true
@@ -11,9 +12,6 @@ cache:
   - "ugs-pendant/src/main/webapp/node"
   - "ugs-pendant/src/main/webapp/node_modules"
 
-jdk:
-- oraclejdk8
-
 before_script:
 - sudo apt-get update -qq
 - pip install --user codecov
@@ -36,6 +34,7 @@ deploy:
     script: bash scripts/deploy.sh nightly
     skip_cleanup: true
     on:
+      repo: winder/Universal-G-Code-Sender
       branch: master
       tags: false
 
@@ -44,6 +43,7 @@ deploy:
     script: bash scripts/deploy.sh $TRAVIS_TAG
     skip_cleanup: true
     on:
+      repo: winder/Universal-G-Code-Sender
       tags: true
 
 env: