Add support for read-only caching in v2

src/cache-utils.ts

@@ -1,3 +1,28 @@
+import * as core from '@actions/core'
+
 export function truncateArgs(args: string): string {
     return args.trim().replace(/\s+/g, ' ').substr(0, 400)
 }
+
+export function isCacheReadEnabled(cacheName: string): boolean {
+    const configValue = getCacheEnabledValue(cacheName)
+    return configValue === 'true' || configValue === 'read-only'
+}
+
+export function isCacheSaveEnabled(cacheName: string): boolean {
+    const configValue = getCacheEnabledValue(cacheName)
+    return configValue === 'true'
+}
+
+function getCacheEnabledValue(cacheName: string): string {
+    const configValue = core
+        .getInput(`${cacheName}-cache-enabled`)
+        .toLowerCase()
+
+    if (['true', 'false', 'read-only'].includes(configValue)) {
+        return configValue
+    }
+    throw new Error(
+        `Invalid cache-enabled parameter '${configValue}'. Valid values are ['true', 'false', 'read-only']`
+    )
+}