Limit pyinstaller package build and deployment to osx in Travis CI

.travis.yml

@@ -12,10 +12,7 @@ script:
 - if [ "$TRAVIS_OS_NAME" = "linux" ]; then xvfb-run -s '-screen 0 640x480x24 +extension GLX' pytest -vs; fi
 before_deploy:
 - export FILENAME=manuskript-$TRAVIS_BRANCH-$TRAVIS_OS_NAME.zip
-- pyinstaller manuskript.spec --clean
-- cd dist && zip $FILENAME -r manuskript && cd ..
-- ls dist
-- cp dist/$FILENAME dist/manuskript-osx-develop.zip
+- if [ "$TRAVIS_OS_NAME" = "osx" ]; then bash package/build_osx.sh; fi
 deploy:
   - provider: releases
     api_key:
@@ -24,11 +21,13 @@ deploy:
     overwrite: true
     skip_cleanup: true
     on:
+        os: osx
         tags: true
   - provider: script
     script: "curl -T dist/manuskript-osx-develop.zip -u hfpn_semaphoreci:$FTP_PASSWORD ftp://www.theologeek.ch/web/manuskript/releases/ -v"
     skip_cleanup: true
     on:
+        os: osx
         branch: develop
 env:
   global:

package/build_osx.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -ev
+if [ z"$FILENAME" = "z" ]; then
+    echo "Error:  Environment variable FILENAME is not set"
+    exit 1
+fi
+pyinstaller manuskript.spec --clean
+cd dist && zip $FILENAME -r manuskript && cd ..
+ls dist
+cp dist/$FILENAME dist/manuskript-osx-develop.zip