Allow Sista+Lowcode vms to fail on Travis/AppVeyor

Author: fniephaus

.appveyor.yml

@@ -95,6 +95,11 @@ environment:
 
 matrix:
   fast_finish: true
+  allow_failures:
+    - FLAVOR: squeak.sista.spur
+    - FLAVOR: pharo.sista.spur
+    - FLAVOR: squeak.cog.spur.lowcode
+    - FLAVOR: pharo.cog.spur.lowcode
 
 notifications:
   - provider: Email

.travis.yml

@@ -118,6 +118,11 @@ jobs:
       bash -c "
     dist: trusty
     group: edge
+  allow_failures:
+  - env: FLAVOR="squeak.sista.spur"
+  - env: FLAVOR="pharo.sista.spur"
+  - env: FLAVOR="squeak.cog.spur.lowcode"
+  - env: FLAVOR="pharo.cog.spur.lowcode"
 
 install: ./.travis_install.sh