chore: add docker ignore to avoid unwanted cache miss (#506)

* chore: add docker ignore to avoid unwanted cache miss

Signed-off-by: Ling Samuel <lingsamuelgrace@gmail.com>

* add license

Signed-off-by: Ling Samuel <lingsamuelgrace@gmail.com>

.dockerignore

@@ -0,0 +1,28 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+# Allowlist
+
+*
+!cmd
+!conf
+!pkg
+!go.mod
+!go.sum
+!Makefile
+!main.go