Add /etc/pki directory to appnet agent's bind mounts

This is the path to the host's PKI directory. The appnet agent container needs
this directory mounted so that it can access the host's PKI directory for the
purpose of utilizing any special CA certs that the underlying EC2 instance has
configured.

agent/engine/serviceconnect/manager_linux.go

@@ -84,6 +84,12 @@ const (
 
 	ecsAgentLogFileENV              = "ECS_LOGFILE"
 	defaultECSAgentLogPathContainer = "/log"
+
+	// This is the path to the host's PKI directory. The appnet agent container needs
+	// this directory mounted so that it can access the host's PKI directory for the
+	// purpose of utilizing any special CA certs that the underlying EC2 instance has
+	// configured.
+	hostPKIDirPath = "/etc/pki"
 )
 
 type manager struct {
@@ -207,6 +213,7 @@ func (m *manager) initAgentDirectoryMounts(taskId string, container *apicontaine
 
 	hostConfig.Binds = append(hostConfig.Binds, getBindMountMapping(statusPathHost, m.statusPathContainer))
 	hostConfig.Binds = append(hostConfig.Binds, getBindMountMapping(m.relayPathHost, m.relayPathContainer))
+	hostConfig.Binds = append(hostConfig.Binds, getBindMountMapping(hostPKIDirPath, hostPKIDirPath))
 
 	// create logging directory and bind mount, if customer has not configured a logging driver
 	if container.GetLogDriver() == "" {

agent/engine/serviceconnect/manager_linux_test_common.go

@@ -129,6 +129,7 @@ func testAgentContainerModificationsForServiceConnect(t *testing.T, privilegedMo
 		fmt.Sprintf("%s/status/%s:%s", tempDir, scTask.GetID(), "/some/other/run"),
 		fmt.Sprintf("%s/relay:%s", tempDir, "/not/var/run"),
 		fmt.Sprintf("%s/log/%s:%s", tempDir, scTask.GetID(), "/some/other/log"),
+		"/etc/pki:/etc/pki",
 	}
 	expectedENVs := map[string]string{
 		"ReLaYgOeShErE":                 "unix:///not/var/run/relay_file_of_holiness",