test: update to latest configs (#104)

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https://source.cloud.google.com/results/invocations/6490b6f9-79ee-41b3-8813-ec1cd161dafb/targets

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Source-Link: googleapis/synthtool@778d8be
Source-Link: googleapis/synthtool@573f765
Source-Link: googleapis/synthtool@ba960d7

.github/header-checker-lint.yml

@@ -0,0 +1,15 @@
+{"allowedCopyrightHolders": ["Google LLC"],
+ "allowedLicenses": ["Apache-2.0", "MIT", "BSD-3"],
+ "ignoreFiles": ["**/requirements.txt", "**/requirements-test.txt"],
+ "sourceFileExtensions": [
+ 	"ts", 
+ 	"js", 
+ 	"java", 
+ 	"sh", 
+ 	"Dockerfile", 
+ 	"yaml", 
+ 	"py",
+ 	"html",
+ 	"txt"
+ ]
+}

.trampolinerc

@@ -18,7 +18,6 @@
 required_envvars+=(
     "STAGING_BUCKET"
     "V2_STAGING_BUCKET"
-    "NOX_SESSION"
 )
 
 # Add env vars which are passed down into the container here.

noxfile.py

@@ -86,6 +86,7 @@ def default(session):
     session.install(
         "mock", "pytest", "pytest-cov",
     )
+
     session.install("-e", ".")
 
     # Run py.test against the unit tests.

synth.metadata

@@ -19,14 +19,14 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "56ddc68f36b32341e9f22c2c59b4ce6aa3ba635f"
+        "sha": "778d8beae28d6d87eb01fdc839a4b4d966ed2ebe"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "56ddc68f36b32341e9f22c2c59b4ce6aa3ba635f"
+        "sha": "778d8beae28d6d87eb01fdc839a4b4d966ed2ebe"
       }
     }
   ],
@@ -58,6 +58,7 @@
     ".github/ISSUE_TEMPLATE/feature_request.md",
     ".github/ISSUE_TEMPLATE/support_request.md",
     ".github/PULL_REQUEST_TEMPLATE.md",
+    ".github/header-checker-lint.yml",
     ".github/release-please.yml",
     ".github/snippet-bot.yml",
     ".gitignore",