Adds save & restore gradle dependency cache scripts (#25)

* Adds save & restore gradle dependency cache scripts

* Add backticks to comments in restore & save gradle dependency cache scripts

Co-authored-by: Gio Lodi <giovanni.lodi42@gmail.com>

Co-authored-by: Gio Lodi <giovanni.lodi42@gmail.com>

bin/restore_gradle_dependency_cache

@@ -0,0 +1,13 @@
+#!/bin/bash -eu
+
+# The key is shared with `bin/save_gradle_dependency_cache`
+GRADLE_DEPENDENCY_CACHE_KEY="GRADLE_DEPENDENCY_CACHE"
+
+echo "Restoring Gradle dependency cache..."
+
+# `save_cache` & `restore_cache` scripts only work if they are called from the same directory
+pushd "$GRADLE_RO_DEP_CACHE_BASE_FOLDER"
+restore_cache "$GRADLE_DEPENDENCY_CACHE_KEY"
+popd
+
+echo "---"

bin/save_gradle_dependency_cache

@@ -0,0 +1,22 @@
+#!/bin/bash -eu
+
+# The key is shared with `bin/restore_gradle_dependency_cache`
+GRADLE_DEPENDENCY_CACHE_KEY="GRADLE_DEPENDENCY_CACHE"
+
+echo "Saving Gradle dependency cache..."
+
+mkdir -p "$GRADLE_RO_DEP_CACHE"
+
+# https://docs.gradle.org/current/userguide/dependency_resolution.html#sub:cache_copy
+# Gradle suggests removing the `*.lock` files and the `gc.properties` file before saving cache
+cp -r ~/.gradle/caches/modules-2 "$GRADLE_RO_DEP_CACHE" \
+    && find "$GRADLE_RO_DEP_CACHE" -name "*.lock" -type f -delete \
+    && find "$GRADLE_RO_DEP_CACHE" -name "gc.properties" -type f -delete
+
+# `save_cache` & `restore_cache` scripts only work if they are called from the same directory
+pushd "$GRADLE_RO_DEP_CACHE_BASE_FOLDER"
+# For now we are using a single key - we might expand on this later by using dependency catalog version
+save_cache "$GRADLE_RO_DEP_CACHE_FOLDER_NAME" "$GRADLE_DEPENDENCY_CACHE_KEY" --force
+popd
+
+echo "---"