Add script for reproducible builds

app/scripts/reproducible

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+set -x
+
+SCRIPTS_DIR="$( cd "$( dirname "$0" )" && pwd )"
+FLUTTER_DIR="$SCRIPTS_DIR/.."
+PROJECT_DIR="$FLUTTER_DIR/.."
+
+APPLICATION_ID="org.stridetasks.stride"
+BUILD_DIR="/tmp/$APPLICATION_ID"
+
+cd "$PROJECT_DIR"
+
+# Remove non-reproducable part of path strings.
+SEP=$(echo -e "\x1f")
+export CARGO_ENCODED_RUSTFLAGS="--remap-path-prefix=${HOME}/.cargo=/cargo/"
+if [ ! -z "$CARGO_HOME" ]; then
+    export CARGO_ENCODED_RUSTFLAGS="$CARGO_ENCODED_RUSTFLAGS${SEP}--remap-path-prefix=${CARGO_HOME}=/cargo/"
+fi
+
+export SOURCE_DATE_EPOCH=1
+export ZERO_AR_DATE=1
+
+rm -rf "$BUILD_DIR"
+
+COMMIT="$(git rev-parse HEAD)"
+ORIGIN="$(git remote get-url origin)"
+git clone --branch "$COMMIT" --reference "$PROJECT_DIR" "$ORIGIN" "$BUILD_DIR"
+
+cd "$BUILD_DIR"
+
+./scripts/rustup-setup
+
+cd app
+
+./flutter build $@
+
+cd "app/build/app/outputs/flutter-apk" "$PROJECT_DIR"/app/build/apks