XENG-8985 Set version correctly on build

Dockerfile

@@ -48,6 +48,7 @@ COPY . /buildrunner-source
 RUN                                                              \
     cd /buildrunner-source &&                                    \
     sed -i s/jaraco-classes/jaraco.classes/ requirements.txt &&  \
+    python3 scripts/write-version.py &&                          \
     pip install . && \
     rm -rf /buildrunner-source
 

pyproject.toml

@@ -4,7 +4,6 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "buildrunner"
-version = "3.15"
 description = "Docker-based build tool"
 readme = "README.rst"
 requires-python = ">=3.6"
@@ -14,7 +13,7 @@ authors = [
 ]
 urls = { "Homepage" = "https://github.com/adobe/buildrunner" }
 
-dynamic = ["dependencies", "optional-dependencies"]
+dynamic = ["version", "dependencies", "optional-dependencies"]
 
 [tool.setuptools.dynamic]
 dependencies = {file = ["requirements.txt"]}
@@ -33,4 +32,4 @@ buildrunner-cleanup = "buildrunner.cli:clean_cache"
 ]
 
 [tool.setuptools.packages.find]
-exclude = ["*.tests", "*.tests.*", "tests.*", "tests"]
+exclude = ["*.tests", "*.tests.*", "tests.*", "tests"]

scripts/write-version.py

@@ -0,0 +1,36 @@
+"""
+Copyright 2025 Adobe
+All Rights Reserved.
+
+NOTICE: Adobe permits you to use, modify, and distribute this file in accordance
+with the terms of the Adobe license agreement accompanying it.
+"""
+import os
+import subprocess
+
+
+def main():
+    major = 3
+    minor = 15
+    try:
+        commit_count = (
+            subprocess.check_output(["git", "rev-list", "--count", "HEAD"])
+            .strip()
+            .decode("utf-8")
+        )
+    except Exception:
+        commit_count = "0"
+
+    version_file = os.path.join(
+        os.path.abspath(os.path.join(__file__, os.pardir, os.pardir)),
+        "buildrunner",
+        "version.py",
+    )
+
+    version = f"{major}.{minor}.{commit_count}"
+    with open(version_file, "w") as version_file:
+        version_file.write(f'__version__ = "{version}"\n')
+
+
+if __name__ == "__main__":
+    main()