Setup Kokoro linux build

Bug b/123360006

Change-Id: I90ebde7968135f136f010d1f526aca26bc2b9418
Reviewed-on: https://swiftshader-review.googlesource.com/c/23988
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
diff --git a/kokoro/gcp_ubuntu/continuous.cfg b/kokoro/gcp_ubuntu/continuous.cfg
new file mode 100644
index 0000000..a20f256
--- /dev/null
+++ b/kokoro/gcp_ubuntu/continuous.cfg
@@ -0,0 +1,4 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Location of the continuous bash script in Git.
+build_file: "SwiftShader/kokoro/gcp_ubuntu/continuous.sh"
diff --git a/kokoro/gcp_ubuntu/continuous.sh b/kokoro/gcp_ubuntu/continuous.sh
new file mode 100755
index 0000000..4caf6ce
--- /dev/null
+++ b/kokoro/gcp_ubuntu/continuous.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Fail on any error.
+set -e
+# Display commands being run.
+set -x
+
+cd git/SwiftShader
+
+git submodule update --init
+
+mkdir -p build && cd build
+
+cmake ..
+make --jobs=$(nproc)