Enable s390x build

.travis.yml

@@ -17,6 +17,7 @@ env:
   - TARGET=arm
   - TARGET=arm64
   - TARGET=ppc64le
+  - TARGET=s390x
 
 matrix:
   fast_finish: true
@@ -24,11 +25,16 @@ matrix:
   - go: tip
   exclude:
   - go: tip
-      env: arm
+    env: TARGET=arm
   - go: tip
-      env: arm64
+    env: TARGET=arm64
   - go: tip
-      env: ppc64le
+    env: TARGET=ppc64le
+  - go: tip
+    env: TARGET=s390x
+  - go: 1.6.x
+    env: TARGET=s390x
+
 
 install:
  - go get ${TOOLS_CMD}/cover

scripts/release-with-rkt.sh

@@ -27,7 +27,7 @@ sudo -E rkt run \
     --exec /bin/bash \
     -- -xe -c "\
     ${FEDORA_INSTALL}; cd /opt/src; umask 0022; 
-    for arch in amd64 arm arm64 ppc64le; do \
+    for arch in amd64 arm arm64 ppc64le s390x; do \
         CGO_ENABLED=0 GOARCH=\$arch ./build ${BUILDFLAGS}; \
         for format in txz tbz2 tgz; do \
             FILENAME=cni-\$arch-${TAG}.\$format; \