Add the container=oci environment variable

This variable was dropped when switching to kiwi.
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2278652

Signed-off-by: Clement Verna <cverna@tutanota.com>

teams/cloud/container.xml

@@ -30,6 +30,9 @@
 					<label name="name" value="fedora"/>
 					<label name="version" value="rawhide"/>
 				</labels>
+				<environment>
+					<env name="container" value="oci"/>
+				</environment>
 			</containerconfig>
 		</type>
 		<timezone>Etc/UTC</timezone>
@@ -57,6 +60,9 @@
 					<label name="name" value="fedora-minimal"/>
 					<label name="version" value="rawhide"/>
 				</labels>
+				<environment>
+					<env name="container" value="oci"/>
+				</environment>
 			</containerconfig>
 		</type>
 		<timezone>Etc/UTC</timezone>
@@ -85,6 +91,9 @@
 					<label name="name" value="fedora-toolbox"/>
 					<label name="version" value="rawhide"/>
 				</labels>
+				<environment>
+					<env name="container" value="oci"/>
+				</environment>
 			</containerconfig>
 		</type>
 		<timezone>Etc/UTC</timezone>