Vault: add a fluent API for configuring Vault's logging level (#2231)

modules/vault/src/main/java/org/testcontainers/vault/VaultContainer.java

@@ -10,6 +10,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Consumer;
 
 import static com.github.dockerjava.api.model.Capability.IPC_LOCK;
 
@@ -106,6 +107,17 @@ public SELF withVaultPort(int port) {
         return self();
     }
 
+    /**
+     * Sets the logging level for the Vault server in the container.
+     * Logs can be consumed through {@link #withLogConsumer(Consumer)}.
+     *
+     * @param level the logging level to set for Vault.
+     * @return this
+     */
+    public SELF withLogLevel(VaultLogLevel level) {
+        return withEnv("VAULT_LOG_LEVEL", level.config);
+    }
+
     /**
      * Pre-loads secrets into Vault container. User may specify one or more secrets and all will be added to each path
      * that is specified. Thus this can be called more than once for multiple paths to be added to Vault.

modules/vault/src/main/java/org/testcontainers/vault/VaultLogLevel.java

@@ -0,0 +1,14 @@
+package org.testcontainers.vault;
+
+/**
+ * Vault preset of logging levels.
+ */
+public enum VaultLogLevel {
+    Trace("trace"), Debug("debug"), Info("info"), Warn("warn"), Error("err");
+
+    public final String config;
+
+    VaultLogLevel(String config) {
+        this.config = config;
+    }
+}