debian-repo-install-test: remove Release.key

Make debian-repo-install-test simpler before copying it for debian10.
Don't install Release.key, as it is getting downloaded on demand in the
related repo-install-test script since osmo-ci
I91e7a208d8f5cb50f8baa2fde0eb979aae91da8f.

Related: OS#4969
Change-Id: Ia2ba9de264531502e2b0b9f42d7a4ecd34375851

debian-repo-install-test/Dockerfile

@@ -3,12 +3,8 @@ ARG	REGISTRY=docker.io
 ARG	UPSTREAM_DISTRO=debian:stretch
 FROM	${REGISTRY}/${UPSTREAM_DISTRO}
 
-COPY	Release.key /tmp/Release.key
-
 RUN	apt-get update && \
 	apt-get install -y --no-install-recommends \
 		aptitude \
 		gnupg \
-		systemd && \
-	apt-key add /tmp/Release.key && \
-	rm /tmp/Release.key
+		systemd

debian-repo-install-test/Release.key

@@ -1,20 +0,0 @@
------BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v1.4.5 (GNU/Linux)
-
-mQENBFJBt/wBCADAht3d/ilNuyzaXYw/QwTRvmjyoDvfXw+H/3Fvk1zlDZoiKPPc
-a1wCVBINUZl7vYM2OXqbJwYa++JP2Q48xKSvC6thbRc/YLievkbcvTemf7IaREfl
-CTjoYpoqXHa9kHMw1aALDm8CNU88jZmnV7v9L6hKkbYDxie+jpoj7D6B9JlxgNJ4
-5dQyRNsFGVcIl4Vplt1HyGc5Q5nQI/VgS2rlF/IOXmhRQBc4LEDdU8R2IKnkU4ee
-S7TWanAigGAQhxGuCkS39/CWzc1DhLhjlNhBl/+RTPejkqJtAy00ZLps3+RqUN1Y
-CU/Fsr7aRlYVGqQ/BlptwV0XQ2VVYJX2oEBBABEBAAG0MG5ldHdvcmsgT0JTIFBy
-b2plY3QgPG5ldHdvcmtAYnVpbGQub3BlbnN1c2Uub3JnPokBPAQTAQIAJgUCXm/4
-pgIbAwUJEEzwqgYLCQgHAwIEFQIIAwQWAgMBAh4BAheAAAoJEGLrGgkXKA3f/1AH
-/A7WVSpfM4wV/DMqZPTsSjChB4JyDotxpV7qHZzBC5aaP2dINZyi9PayIwZWbvCY
-VKvt+Fw8oCGC9F9mdh10Xe+ElHeVNSihzABPuu1RkRkb1nvkymScy0yxydodYOBi
-K4WQ+BhpijXWmYvOekIwbS5Hi9BHpfgK4TinK0xsvh1bVLeQJ8YjrnNFIAR2CnBa
-X7Y72Up/kKL08DdQzuS+mKrJtAQlGMtIsukWC2ajYQMkNwm8Gvhpn8za113dCkBW
-XAFnlQqQobKwC7b19QgEtJI/YpGSrRc6WaZxPyAjscbWQlFEAB900sVj4BWT55ig
-7O2uSdsCVhTuU7T0ztwsgvmIRgQTEQIABgUCUkG3/AAKCRA7MBG3a51lIzhdAJ9v
-d6XPffMZRcCGgDEY5OaTn/MsCQCgrXbeZpFJgnirSrc8rRonvzYFiF4=
-=/Tek
------END PGP PUBLIC KEY BLOCK-----