add appimage support to packaging

[TheTollingBell]

This resolves issue #1222.

Potential problems:

• This does the building of image after the deb and before the rpm. If the ordering matters just say the word and I'll change it.
• Someone with a more intimate knowledge of Haveno should look at the Haveno.desktop file to see if it fits with the projects theme.

[TheTollingBell]

Apparently, running AppImage's (like the appimagetool AppImage) would require some changes to the CI. I'm looking into it now. I'm probably going to end up just using the prebuilt binaries instead.

[TheTollingBell]

Probably something to note in a separate issue, but packaging the entire project once as a jpackage app-image and then doing separate packaging off of that would significantly improve CI time.

[TheTollingBell]

@woodser Can I get a review on this?

[woodser]

@Jabster28 Mind reviewing this? :) I'm not running Linux at the moment.

[Jabster28]

Yep works on my machine. A few pedantic notes about the .desktop file, but it'd be fine to merge as-is. I'll let you know when the sample trade completes.

[TheTollingBell]

Everything should be up to date with your suggestions.

[Jabster28]

LGTM. @woodser you might want to check the changes to the gradle for formatting etc but everything functionally looks perfect.

[TheTollingBell]

Hey, @woodser, is there a problem with the Gradle file formatting or is this good to merge?

[woodser]

Hi @TheTollingBell, please rebase on master.

[TheTollingBell]

@woodser Rebased and added AppImage artifact

[woodser]

Thanks.

[woodser]

@TheTollingBell There's still a merge conflict with master. Once that's resolved I can merge this.

Edit: Nevermind, I can merge by squashing your commits :)

[woodser]

@TheTollingBell Actually there is a merge commit which has conflicts with master. Please do squash your commits to a single commit and rebase on master. Thanks!

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (ea3f099)	41334	4746	11.48%
Head commit (cf94753)	41334 (+0)	4746 (+0)	11.48% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1270)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[woodser]

Nevermind was able to work through it. :)