build: Add a conanfile to package artifacts (protocolbuffers#16)

Issue-number: https://devtopia.esri.com/runtime/devops/issues/693

conanfile_rtc.py

@@ -0,0 +1,19 @@
+from conans import ConanFile
+
+
+class ProtobufConan(ConanFile):
+    name = "protobuf"
+    version = "3.11.0"
+    url = "https://github.com/Esri/protobuf/tree/runtimecore"
+    license = "https://github.com/Esri/protobuf/blob/runtimecore/LICENSE"
+    description = "Protocol Buffers (a.k.a. protobuf) are Google's language-neutral platform-neutral extensible mechanism for serializing structured data."
+
+    # RTC specific triple
+    settings = "platform_architecture_target"
+
+    def package(self):
+        base = self.source_folder + "/"
+
+        # libraries
+        output = "output/" + str(self.settings.platform_architecture_target) + "/staticlib"
+        self.copy("*" + self.name + "*", src=base + "../../" + output, dst=output, excludes="*protobuf_generated*")