add convenience test script for checking if CI would pass

Author: CramBL

test.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+set -euxo pipefail
+
+need() {
+    if ! command -v "$1" > /dev/null 2>&1; then
+        echo "need $1 (command not found)"
+        exit 1
+    fi
+}
+
+cargo clippy -- -D warnings
+cargo fmt --all -- --check
+
+FEATURE_SETS=(
+    "--features=alloc,std,ubx_proto23"
+    "--no-default-features --features=alloc,ubx_proto23"
+    "--no-default-features --features=ubx_proto23"
+    "--no-default-features --features=ubx_proto27"
+)
+
+for features in "${FEATURE_SETS[@]}"; do
+    cargo build ${features}
+    cargo test ${features}
+done
+
+# Examples - using a subshell to isolate directory changes
+(
+    cd examples || exit 1
+    cargo build --release
+    cargo fmt --all -- --check
+    cargo clippy --all-targets -- -D warnings
+    cargo hack check --rust-version --workspace
+)
+
+
+need cargo-hack
+cargo hack check --rust-version --workspace
+(
+    cd examples || exit 1
+    cargo hack check --rust-version --workspace
+)