android: add fdroid build script (#1317)

nym-vpn-android/scripts/fdroid-prebuild.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+set -eux
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+REPO_DIR="$SCRIPT_DIR/../../"
+
+# Install Rust
+curl -sf -L https://sh.rustup.rs > /tmp/rustup.sh
+chmod +x /tmp/rustup.sh
+/tmp/rustup.sh -y
+# shellcheck source=/dev/null
+source "$HOME/.cargo/env"
+rustup set profile minimal
+rustup target add \
+    i686-linux-android \
+    x86_64-linux-android \
+    aarch64-linux-android \
+    armv7-linux-androideabi
+
+# Install golang
+GOLANG_VERSION="1.21.3"
+# Checksum from: https://golang.org/dl/
+GOLANG_HASH="1241381b2843fae5a9707eec1f8fb2ef94d827990582c7c7c32f5bdfbfd420c8"
+cd "$HOME"
+curl -sf -L -o go.tgz https://go.dev/dl/go${GOLANG_VERSION}.linux-amd64.tar.gz
+echo "$GOLANG_HASH go.tgz" | sha256sum -c
+tar -xzvf go.tgz
+patch -p1 -f -N -r- -d "$HOME/go" < "$REPO_DIR/wireguard/libwg/goruntime-boottime-over-monotonic.diff"
+
+# Ensure Go compiler is accessible
+export GOROOT="$HOME/go"
+export PATH="$PATH:$GOROOT/bin"
+
+# install cargo dependencies
+cargo install cargo-ndk cargo-license --locked
+
+# install other dependencies
+sudo apt-get update && sudo apt-get install -y libdbus-1-dev libmnl-dev libnftnl-dev protobuf-compiler git curl gcc g++ make unzip