Stop publishing snapshots from CI

The corresponding jobs keep running into `java.net.ProtocolException: Too many follow-up requests: 21`.

Might try again to publish those, with sbt-dynver or an equivalent enabled,
via Travis CI stages.

.travis.yml

@@ -11,7 +11,7 @@ addons:
     update: true
 matrix:
   include:
-    - env: SCALA_VERSION=2.12 NATIVE=1 PUBLISH=1
+    - env: SCALA_VERSION=2.12 NATIVE=1
       os: linux
       jdk: oraclejdk8
       sudo: required
@@ -19,13 +19,13 @@ matrix:
       - curl https://raw.githubusercontent.com/scala-native/scala-native/master/scripts/travis_setup.sh | bash -x
       services:
         - docker
-    - env: SCALA_VERSION=2.11 PUBLISH=1
+    - env: SCALA_VERSION=2.11
       os: linux
       jdk: oraclejdk8
       sudo: required
       services:
         - docker
-    - env: SCALA_VERSION=2.10 PUBLISH=1
+    - env: SCALA_VERSION=2.10
       os: linux
       jdk: oraclejdk8
       sudo: required

scripts/travis.sh

@@ -95,10 +95,6 @@ checkBinaryCompatibility() {
   sbt scalaFromEnv coreJVM/mimaReportBinaryIssues cacheJVM/mimaReportBinaryIssues
 }
 
-publish() {
-  sbt scalaFromEnv publish
-}
-
 testBootstrap() {
   if [ "$SCALA_VERSION" = 2.12 ]; then
     sbt scalaFromEnv "project cli" pack
@@ -221,12 +217,3 @@ else
   fi
 fi
 
-
-PULL_REQUEST="${PULL_REQUEST:-${TRAVIS_PULL_REQUEST:-false}}"
-BRANCH="${BRANCH:-${TRAVIS_BRANCH:-$(git rev-parse --abbrev-ref HEAD)}}"
-PUBLISH="${PUBLISH:-0}"
-
-if [ "$PUBLISH" = 1 -a "$PULL_REQUEST" = false -a "$BRANCH" = master ]; then
-  publish
-fi
-