Add Snyk file to exclude directories on scan

This commit makes .synk file to exclude vendor net/http2, images
directories and ci config file from vulnerability scan.

Signed-off-by: Periyasamy Palanisamy <pepalani@redhat.com>

Author: pperiyasamy

.snyk

@@ -0,0 +1,8 @@
+# References:
+# https://docs.snyk.io/scan-applications/snyk-code/using-snyk-code-from-the-cli/excluding-directories-and-files-from-the-snyk-code-cli-test
+# https://docs.snyk.io/snyk-cli/commands/ignore
+exclude:
+  global:
+    - vendor/golang.org/x/net/http2
+    - images/**
+    - .ci-operator.yaml