CASM-4669 Support sigstore attachments in skopeo

quay.io/skopeo/stable/v1/Dockerfile

@@ -1,7 +1,7 @@
 #
 # MIT License
 #
-# (C) Copyright [2023] Hewlett Packard Enterprise Development LP
+# (C) Copyright 2023-2024 Hewlett Packard Enterprise Development LP
 #
 # Permission is hereby granted, free of charge, to any person obtaining a
 # copy of this software and associated documentation files (the "Software"),
@@ -23,4 +23,5 @@
 #
 FROM quay.io/skopeo/stable:v1
 
+COPY etc/containers/registries.d/enable-signatures.yaml /etc/containers/registries.d/enable-signatures.yaml
 RUN yum -y upgrade && yum clean all

quay.io/skopeo/stable/v1/etc/containers/registries.d/enable-signatures.yaml

@@ -0,0 +1,25 @@
+#
+# MIT License
+#
+# (C) Copyright 2024 Hewlett Packard Enterprise Development LP
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+#
+default-docker:
+ use-sigstore-attachments: true