Implement gradle rust plugin

[Pururun]

Draft PR, very rough, mostly to spot any issues with CI, but feel free to review. :)

Things left to be decided:

• Can we use a symlink for the maybenot_machines? Will it work on windows? This file is no longer required.
• How do we handle the difference between debug/release? Currently we check if the starting task contains "release". This will break if we build debug and release at the same time. However I don't think we do this, so maybe it is an ok solution for now?
• Currently we only generate a new relays.json file if none exists or if it is a release build (see above for how we determine that). We could add further checks for maybe the age of the file or add a flag to force it to always build. We decided to move relays.json back into build, so that it will be deleted on gradle clean
• How do we handle flags and local properties. We should avoid using the local.properties file, but what should we use instead? The plugin already uses local.properties so we can continue use it for now.
• Should we do cargo clean when gradle clean is run?

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This change is 

[linear]

DROID-1377 Implement gradle rust plugin

[MarkusPettersson98]

Things left to be decided:

* Can we use a symlink for the maybenot_machines? Will it work on windows?

This should no longer be needed when #7158 is merged 😊

[MarkusPettersson98]

Reviewable status: 0 of 16 files reviewed, 1 unresolved discussion (waiting on @Pururun)

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android/.gitignore line 6 at r2 (raw file):

local.properties
# We want to generate relays.json not store it
app/src/main/assets/relays.json

This seems applicable to all platforms! Should we move the ignore to the root .gitignore? 😊

Code quote:

# We want to generate relays.json not store it
app/src/main/assets/relays.json

[MarkusPettersson98]

Reviewable status: 0 of 16 files reviewed, 5 unresolved discussions (waiting on @Pururun)

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wireguard-go-rs/build.rs line 236 at r2 (raw file):

    let mut move_command = Command::new("cp");
    move_command
        .arg("-p")

⛏️ move_command should probably be renamed now that cp is used instead of mv 😉

Also, could we document why the -p flag is important? 🙏

Code quote:

    let mut move_command = Command::new("cp");
    move_command
        .arg("-p")

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android/build-apk.sh line 21 at r2 (raw file):

RUN_PLAY_PUBLISH_TASKS="no"
PLAY_PUBLISH_TASKS=()
SKIP_STRIPPING=${SKIP_STRIPPING:-"no"}

⛏️ This seems to be unused (🎉)

Code quote:

SKIP_STRIPPING=${SKIP_STRIPPING:-"no"}

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android/build-apk.sh line 56 at r2 (raw file):

    elif [[ "$PRODUCT_VERSION" == *"-alpha"* ]]; then
        echo "Removing old Rust build artifacts"
        cargo clean

Is the intention to get rid of all explicit invocations of cargo in this script? Is cargo clean run when invoking gradlew clean? 😊

Code quote:

        echo "Removing old Rust build artifacts"
        cargo clean

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android/build-apk.sh line 61 at r2 (raw file):

        PLAY_PUBLISH_TASKS=(publishPlayStagemoleReleaseBundle)
    else
        cargo clean

dito

Code quote:

cargo clean

[Pururun]

That is great. :)

Reviewable status: 0 of 16 files reviewed, 3 unresolved discussions (waiting on @MarkusPettersson98)

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wireguard-go-rs/build.rs line 236 at r2 (raw file):

Previously, MarkusPettersson98 (Markus Pettersson) wrote…

⛏️ move_command should probably be renamed now that cp is used instead of mv 😉

Also, could we document why the -p flag is important? 🙏

Done

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android/build-apk.sh line 21 at r2 (raw file):

Previously, MarkusPettersson98 (Markus Pettersson) wrote…

⛏️ This seems to be unused (🎉)

Nice catch!. Removed.

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android/build-apk.sh line 56 at r2 (raw file):

Previously, MarkusPettersson98 (Markus Pettersson) wrote…

Is the intention to get rid of all explicit invocations of cargo in this script? Is cargo clean run when invoking gradlew clean? 😊

Cargo clean is not invoked when running gradle clean. Maybe we want to do it, I'll add it to the list.

[Pururun]

Reviewable status: 0 of 17 files reviewed, 3 unresolved discussions (waiting on @MarkusPettersson98)

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android/.gitignore line 6 at r2 (raw file):

Previously, MarkusPettersson98 (Markus Pettersson) wrote…

This seems applicable to all platforms! Should we move the ignore to the root .gitignore? 😊

We decided to move the file back into build so it will be ignored.