make gardenlinux_epoch in s3 artifact manifest an integer

.github/actions/features_parse/action.yml

@@ -11,7 +11,7 @@ outputs:
 runs:
   using: composite
   steps:
-    - uses: gardenlinux/python-gardenlinux-lib/.github/actions/[email protected].1
+    - uses: gardenlinux/python-gardenlinux-lib/.github/actions/[email protected].2
     - id: result
       shell: bash
       run: |

.github/actions/flavors_parse/action.yml

@@ -13,7 +13,7 @@ outputs:
 runs:
   using: composite
   steps:
-    - uses: gardenlinux/python-gardenlinux-lib/.github/actions/[email protected].1
+    - uses: gardenlinux/python-gardenlinux-lib/.github/actions/[email protected].2
     - id: matrix
       shell: bash
       run: |

.github/actions/setup/action.yml

@@ -3,7 +3,7 @@ description: Installs the given GardenLinux Python library
 inputs:
     version:
         description: GardenLinux Python library version
-        default: "0.8.1"
+        default: "0.8.2"
 runs:
     using: composite
     steps:

src/gardenlinux/s3/s3_artifacts.py

@@ -146,7 +146,7 @@ def upload_from_directory(
             "base_image": None,
             "build_committish": commit_hash,
             "build_timestamp": datetime.fromtimestamp(release_timestamp).isoformat(),
-            "gardenlinux_epoch": cname_object.version.split(".", 1)[0],
+            "gardenlinux_epoch": int(cname_object.version.split(".", 1)[0]),
             "logs": None,
             "modifiers": feature_list,
             "require_uefi": "_usi" in feature_list,