Ensure S3 aritfact metadata gardenlinux_epoch remains a int

This commit ensures if a version is defined the major version number is used as `gardenlinux_epoch`

Signed-off-by: Tobias Wolf <wolf@b1-systems.de>
On-behalf-of: SAP <tobias.wolf@sap.com>

Author: NotTheEvilOne

src/gardenlinux/s3/s3_artifacts.py

@@ -169,18 +169,12 @@ def upload_from_directory(
         if commit_id_or_hash is None:
             commit_id_or_hash = cname_object.commit_id
 
-        version_epoch = str(cname_object.version_epoch)
-
-        if version_epoch is None:
-            version_epoch = ""
-
         metadata = {
             "platform": cname_object.feature_set_platform,
             "architecture": arch,
             "base_image": None,
             "build_committish": commit_id_or_hash,
             "build_timestamp": datetime.fromtimestamp(release_timestamp).isoformat(),
-            "gardenlinux_epoch": version_epoch,
             "logs": None,
             "modifiers": feature_set_list,
             "require_uefi": require_uefi,
@@ -193,6 +187,9 @@ def upload_from_directory(
             "paths": [],
         }
 
+        if cname_object.version_epoch is not None:
+            metadata["gardenlinux_epoch"] = cname_object.version_epoch
+
         platform_variant = cname_object.platform_variant
 
         if platform_variant is not None:

tests/s3/constants.py

@@ -17,7 +17,6 @@
 base_image: null
 build_committish: abc123lo
 build_timestamp: '{build_timestamp}'
-gardenlinux_epoch: '1234'
 logs: null
 modifiers:
 - _usi
@@ -36,4 +35,5 @@
   suffix: .release
   md5sum: {md5sum}
   sha256sum: {sha256sum}
+gardenlinux_epoch: 1234
 """.strip()