/usr/share/perl5/Mojo/IOLoop/server.key is in libmojolicious-perl 5.54+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | -----BEGIN RSA PRIVATE KEY-----
MIICXAIBAAKBgQCohcU0qG+hHn6JK8XdygAJo7EuRqG25GSHaRRMyYgd89tEluIn
MH86tVcktJ1s/0VVvr5anAp8L7Pgu01Wr13OfgIzBxCz51ZIFxq4DtimBftXs9Z9
M0sui2NuIPDrMEjkYUhUsxMEZcDSp2KJjDosZjSYUiiFG2ACvVGXSrS16QIDAQAB
AoGALSdqp6lZ/7nD/c0Uv1CYofySROv3+KFJrl6hadG1/xCP99jVz9pWvMxKBTO/
2qyrT0ZEitK0nIHLmLOXDVr/rxzbxP/kHmkOLKj45jW31BSap89tUpFjFQXFfjwT
YnOgOB4+eqQuGwigCqabcQPtFC4fU7Qzk7pdz/kO4FjR0GECQQDdXthCKgS7E5Zy
qqzjepxYvKgkWPD3G9H6I8LOtiVBdcehflF8Y61OGsEST3pbOhrijhY281VnD1AG
pNL1rOhDAkEAwuKKTN+2GF3m1mPtGW9jpkP8gU2zcO945U0jxpn2srjQ9oIoB45Y
gqtE6yybRY4BBd+hMdgeH5dXSwsZW+FMYwJASrFy5LhKylisndoq5cJ8OJDHZyQ/
ghF4Ax/H3nmlDnZQOpRlqEP1uPHcDXKVxWxQn/rzUe0+9rw681Lv/4ctAwJAfyLO
2muvHaJUr1QtH0S9m4AKwEfyYiC3m8+BIVTbzagoGki62IMSVtxob4uAGBYVsME9
JYk5zZ4rgndRKdGGxQJBAIpbdLBKArvnpbYIqNJGG83mUZ/VZaQl0G+S3zGkgre9
KjIuz10nNMNAKmGRrTbClLtvAQ9MVa3Xjnp+XmxPFho=
-----END RSA PRIVATE KEY-----
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