travis: add coverity bits

.travis.yml

@@ -26,3 +26,22 @@ notifications:
       - "irc.freenode.org#pkgconf"
     on_success: change
     on_failure: always
+
+env:
+  global:
+   # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
+   #   via the "travis encrypt" command using the project repo's public key
+   - secure: "blUnmLjOjZ1l9jSUff2gka+O6zI82wOMF/6zk6domstMjWbdRQFuEijkAngLyRYa/6uwbNQezqktJficEOvnU5kjq/IVUPkVTWR/nwhZdOpB4ksllpEWX6LH90HqxEaMqGZEaqPEG5uCYW+8pwTgWesPVzc0TF552WNoh4swAhs="
+
+before_install:
+      - echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-
+
+addons:
+  coverity_scan:
+    project:
+      name: "pkgconf/pkgconf"
+      description: "package compiler and linker metadata toolkit"
+    notification_email: nenolod@dereferenced.org
+    build_command_prepend: ./configure
+    build_command: make
+    branch_pattern: coverity