fix: "No package docker available" on AL2

[kichik]

Installing Docker on Amazon Linux 2 based images failed with:

4.636 No package docker available.
4.879 Error: Nothing to do
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Dockerfile:19
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17 |
18 |     COPY component5-Docker.sh /tmp
19 | >>> RUN /tmp/component5-Docker.sh
20 |
21 |     COPY component6-GithubRunner.sh /tmp
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ERROR: failed to solve: process "/bin/sh -c /tmp/component5-Docker.sh" did not complete successfully: exit code: 1

Fixes #646