Add Travis based Coverity trigger (#778)

.ci/trigger-coverity.sh

+#!/bin/bash
+
+set -x
+set -o errexit -o nounset
+
+if test "x$TRAVIS_EVENT_TYPE" != x"cron"; then exit; fi
+
+BRANCH="$TRAVIS_BRANCH"
+if test "x$BRANCH" != xmaster; then exit; fi
+
+git fetch --unshallow
+git remote add upstream "https://$GH_TOKEN@github.com/harfbuzz/harfbuzz.git"
+git push -q upstream master:coverity_scan

.travis.yml

@@ -11,6 +11,8 @@ env:
     - LDFLAGS="--coverage"
     - CONFIGURE_OPTS="--with-freetype --with-glib --with-gobject --with-cairo --with-icu --with-graphite2"
     - NOCONFIGURE=1
+    # COVERITY_SCAN_TOKEN
+    - secure: "MRJtVu/fQoWNwMAamvIJBCX/1SMvEuEUk/ljAif/y2/3syyWgxFGp17UGnDILdoZYyCqTM+jQciY2P0nVqbjjOAUlML4QOAalqw8kPp8iTsnHUe+KOMVrOVP6p6qAQxk1im1O41cCMkmVKvk+NXe/on5euz6LGF2laHZaOAMoes="
 
 matrix:
   include:
@@ -28,6 +30,7 @@ matrix:
       after_success:
         - bash .ci/run-coveralls.sh # for coveralls.io code coverage tracking
         - bash .ci/deploy-docs.sh
+        - bash .ci/trigger-coverity.sh
 
     - os: linux
       compiler: clang
@@ -73,3 +76,14 @@ addons:
       - libicu-dev # for extra unicode functions
       - libgraphite2-dev # for extra shapers
       #- libgirepository1.0-dev # for gobject-introspection
+
+addons:
+  coverity_scan:
+    project:
+      name: harfbuzz/harfbuzz
+      version: 1.0
+      description: HarfBuzz OpenType text shaping engine
+    notification_email: harfbuzz@lists.freedesktop.org
+    build_command_prepend: ./autogen.sh --with-freetype --with-glib --with-gobject --with-cairo --with-icu --with-graphite2
+    build_command: make
+    branch_pattern: coverity_scan
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