RFR: [WIP - for some reason it builds, but skips tests] Added github actions

[Jiří Vaněk]

Just for record for "act" for local testing. To run with podman based distros, several steps are ncessary. See https://github.com/nektos/act/issues/303 ; especially
 * https://github.com/nektos/act/issues/303#issuecomment-937698375
 *  and https://github.com/nektos/act/issues/303#issuecomment-962403508
    *   the bind and socket
eg:
 systemctl enable --now --user podman.socket
 systemctl start --user podman.socket
 export DOCKER_HOST=unix://$XDG_RUNTIME_DIR/podman/podman.sock
 ../act/bin/act   --bind --container-daemon-socket $XDG_RUNTIME_DIR/podman/podman.sock

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Commit messages:
 - Added github actions

Changes: https://git.openjdk.org/asmtools/pull/45/files
 Webrev: https://webrevs.openjdk.org/?repo=asmtools&pr=45&range=00
  Stats: 48 lines in 1 file changed: 48 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/asmtools/pull/45.diff
  Fetch: git fetch https://git.openjdk.org/asmtools pull/45/head:pull/45

PR: https://git.openjdk.org/asmtools/pull/45