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The links used to download Mambo have stopped working:

  Step 5/9 : RUN if [ `arch` = "x86_64" ]; then dnf -y install http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0.f22.x86_64.rpm; fi
   ---> Running in 4676caeeb953
  Last metadata expiration check: 0:03:46 ago on Thu Jan 19 16:06:19 2023.
  [MIRROR] systemsim-p9-1.1-0.f22.x86_64.rpm: Curl error (56): Failure when receiving data from the peer for http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0.f22.x86_64.rpm [Recv failure: Connection reset by peer]
  [MIRROR] systemsim-p9-1.1-0.f22.x86_64.rpm: Curl error (56): Failure when receiving data from the peer for http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0.f22.x86_64.rpm [Recv failure: Connection reset by peer]
  [MIRROR] systemsim-p9-1.1-0.f22.x86_64.rpm: Curl error (56): Failure when receiving data from the peer for http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0.f22.x86_64.rpm [Recv failure: Connection reset by peer]
  [MIRROR] systemsim-p9-1.1-0.f22.x86_64.rpm: Curl error (56): Failure when receiving data from the peer for http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0.f22.x86_64.rpm [Recv failure: Connection reset by peer]
  [FAILED] systemsim-p9-1.1-0.f22.x86_64.rpm: Curl error (56): Failure when receiving data from the peer for http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0.f22.x86_64.rpm [Recv failure: Connection reset by peer]
  Curl error (56): Failure when receiving data from the peer for http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0.f22.x86_64.rpm

 [Recv failure: Connection reset by peer]

Oddly, this only happens with dnf. Using curl directly to fetch the
package works. Since the issue is isolated to http, let's just change
these links to https, which is probably a good idea regardless.
Signed-off-by: Reza Arbab <arbab@linux.ibm.com>