docs: Add default template that diverts to sub templates (#7306)

This PR fixes this known github issue where multiple PR templates is not supported in Github.
It is an add on to PR# 7290

.github/pull_request_template.md

@@ -0,0 +1,13 @@
+Thanks for submitting a PR to Triton!
+Please go the the `Preview` tab above this description box and select the appropriate sub-template:
+
+* [PR description template for Triton Engineers](?expand=1&template=pull_request_template_internal_contrib.md)
+* [PR description template for External Contributors](?expand=1&template=pull_request_template_external_contrib.md)
+
+If you already created the PR, please replace this message with one of
+* [External contribution template](https://raw.githubusercontent.com/triton-inference-server/server/main/.github/PULL_REQUEST_TEMPLATE/pull_request_template_external_contrib.md)
+* [Internal contribution template](https://raw.githubusercontent.com/triton-inference-server/server/main/.github/PULL_REQUEST_TEMPLATE/pull_request_template_internal_contrib.md)
+
+and fill it out.
+
+

qa/common/check_copyright.py

@@ -33,19 +33,20 @@
 
 FLAGS = None
 SKIP_EXTS = (
-    "jpeg",
-    "jpg",
-    "pgm",
-    "png",
-    "log",
-    "preprocessed",
-    "jmx",
-    "gz",
-    "json",
-    "pdf",
-    "so",
-    "onnx",
-    "svg",
+    ".jpeg",
+    ".jpg",
+    ".pgm",
+    ".png",
+    ".log",
+    ".preprocessed",
+    ".jmx",
+    ".gz",
+    ".json",
+    ".pdf",
+    ".so",
+    ".onnx",
+    ".svg",
+    "pull_request_template.md",
 )
 REPO_PATH_FROM_THIS_FILE = "../.."
 SKIP_PATHS = (
@@ -130,7 +131,7 @@ def visit(path):
         print("visiting " + path)
 
     for skip in SKIP_EXTS:
-        if path.endswith("." + skip):
+        if path.endswith(skip):
             if FLAGS.verbose:
                 print("skipping due to extension: " + path)
             return True