Add docker repo key adding the docker repo

Change-Id: I752a1c3d746aec3fa417a416311f5d6a7730aee2
(cherry picked from commit 81d139027a0bd3dfce532a249a2fc18b26ab1c20)
diff --git a/ansible/roles/docker/files/docker_apt_key.gpg b/ansible/roles/docker/files/docker_apt_key.gpg
new file mode 100644
index 0000000..f63466b
--- /dev/null
+++ b/ansible/roles/docker/files/docker_apt_key.gpg
@@ -0,0 +1,47 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: SKS 1.1.5
+
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+-----END PGP PUBLIC KEY BLOCK-----