chore(java): detect sample-secrets in build.sh (googleapis#414)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/a763fd2f-97fc-47b9-8fd9-6836f6295138/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

Source-Link: googleapis/synthtool@bb854b6

Author: yoshi-automation

java-resourcemanager/.kokoro/build.sh

@@ -79,6 +79,11 @@ samples)
 
     if [[ -f ${SAMPLES_DIR}/pom.xml ]]
     then
+        for FILE in ${KOKORO_GFILE_DIR}/secret_manager/*-samples-secrets; do
+          [[ -f "$FILE" ]] || continue
+          source "$FILE"
+        done
+
         pushd ${SAMPLES_DIR}
         mvn -B \
           -Penable-samples \

java-resourcemanager/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-resourcemanager.git",
-        "sha": "772860e73f71cd69ed88c4b7c4e1173c6b3a5457"
+        "sha": "069170b6f8ed65674303777fe5348cbe199c95a4"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "0b064d767537e0675fc053e53fca473c5c701fb8"
+        "sha": "bb854b6c048619e3be4e8b8ce8ed10aa74ea78ef"
       }
     }
   ],