Add s390x arch support for k3s (#5018)

* Update docs to include s390x arch

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Add s390x drone pipeline

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Install trivy linux arch only for amd64

This is done so that trivy is not installed for s390x arch

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Add s390x arch if condition for Dockerfile.test

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Add s390x arch in install script

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Add s390x GOARCH in build script

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Add SUFFIX s390x in scripts

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Skip image scan for s390x arch

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Update klipper-lb to version v0.3.5

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Update traefik version to v2.6.2

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Update registry to v2.8.1 in tests which supports s390x

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

* Skip compact tests for s390x arch

This is done because compact test require a previous k3s version which supports s390x and it is not available

Signed-off-by: Venkata Krishna Rohit Sakala <rohitsakala@gmail.com>

scripts/build

@@ -68,6 +68,10 @@ if [ ${ARCH} = armv7l ] || [ ${ARCH} = arm ]; then
     export GOARM="7"
 fi
 
+if [ ${ARCH} = s390x ]; then
+    export GOARCH="s390x"
+fi
+
 rm -f \
     bin/k3s-agent \
     bin/k3s-server \