Readded alpine3-container for a few straggler images

pipeline1/0-setup/image_inspect.py

@@ -49,6 +49,12 @@ def template_type(os_type: str) -> None:
             "DISTRO_REPO_MOUNT": "/etc/apk/repositories",
             "OS_TYPE": "alpine321-container",
         },
+        "alpine3-container": {
+            "DISTRO": "alpine",
+            "DISTRO_REPO_DIR": "apk-repos/repositories",
+            "DISTRO_REPO_MOUNT": "/etc/apk/repositories",
+            "OS_TYPE": "alpine3-container",
+        },
         # amazon2023 has a datastream, but doesn't have an OVAL.
         "amazonlinux2023-container": {
             "DISTRO": "amazonlinux2023",