infra: remove jobs from travis config

.travis.yml

@@ -8,12 +8,6 @@ cache:
   directories:
     - ~/.m2
 
-addons:
-  apt:
-    packages:
-      - xmlstarlet
-      - maven
-
 branches:
   only:
     - master
@@ -23,61 +17,11 @@ install: true
 
 jobs:
   fast_finish: true
-  include:
-    # eclipse-cs
-    - jdk: openjdk11
-      env:
-        - DESC="eclipse-cs"
-        - USE_MAVEN_REPO="true"
-        - CMD="./.ci/validation.sh eclipse-cs"
-
-    # idea-extension
-    - jdk: openjdk11
-      env:
-        - DESC="idea-extension"
-        - USE_MAVEN_REPO="true"
-        - CMD="./.ci/validation.sh idea-extension"
-
-    # sonar-plugin
-    - jdk: openjdk11
-      env:
-        - DESC="sonar-plugin"
-        - USE_MAVEN_REPO="true"
-        - CMD="./.ci/validation.sh sonar-plugin"
-
-    # checks
-    - jdk: openjdk11
-      env:
-        - DESC="checks"
-        - USE_MAVEN_REPO="true"
-        - CMD="./.ci/validation.sh sevntu-checks"
-
-    # Ensure that all sevntu checks are used in contribution
-    - jdk: openjdk11
-      env:
-        - DESC="All sevntu checks should be used in contribution"
-        - CMD="./.ci/validation.sh all-sevntu-checks-contribution"
-
-    # regression on checkstyle
-    - jdk: openjdk11
-      env:
-        - DESC="checkstyle-regression"
-        - USE_MAVEN_REPO="true"
-        - CMD="./.ci/validation.sh checkstyle-regression"
-
-    # eclipse static analysis
-    - jdk: openjdk11
-      env:
-        - DESC="eclipse-analysis"
-        - USE_MAVEN_REPO="true"
-        - CMD="./.ci/validation.sh eclipse-analysis"
-
-    # https://sonarcloud.io (openjdk11)
+  allow_failures:
     - jdk: openjdk11
       env:
-        - DESC="sonarcloud.io"
-        - USE_MAVEN_REPO="true"
-        - CMD="./.ci/validation.sh sonarqube"
+        - DESC="no-op"
+        - CMD="echo 'no-op'"
 
 script:
   # required to run javadoc in travis