F dot in username

Summary

Adds a very simple User class and methods for creation, retrieval and deletion. This allows us to test the user creation/deletion of the GRPC API.

The User class and the methods are only available when the newly introduced "BUILD_ACM" macro is set. The make files and the pipeline has been updated for this.

Focus

The User class is designed after the delegator/wrapper pattern where UserImpl is the delegate. The UserImpl class is a wrapper for protobuf's User message objects. This might look clumsy at first but it has the advantage that the grpc/protobuf code is encapsuled and hidden in the *.cpp file. This is a first test which demonstrates how we can remove the grpc/protobuf dependency from the headers altogether (which will make it easier to compile the library as a shared library on windows).

Test Environment

• See unit test in test_user
• See integration tests in caosdb-cppinttest!23 (merged)

Check List for the Author

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• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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include/caosdb/acm/permission_rule.h

@@ -29,9 +29,9 @@
 #ifndef CAOSDB_ACM_PERMISSION_RULE_H
 #define CAOSDB_ACM_PERMISSION_RULE_H
 
-#include <stddef.h>       // for size_t
+#include <stddef.h>      // for size_t
 #include <unordered_set> // for unordered_set
-#include <string> // for string
+#include <string>        // for string
 
 namespace caosdb::acm {
 
@@ -52,12 +52,13 @@ public:
   [[nodiscard]] auto GetPermission() const -> const std::string &;
 
   auto operator==(const PermissionRule &other) const -> bool;
+
 private:
   PermissionRuleImpl *impl;
 };
 
 struct HashPermissionRule {
-  auto operator()(const PermissionRule& rule) const -> size_t;
+  auto operator()(const PermissionRule &rule) const -> size_t;
 };
 
 using PermissionRules = std::unordered_set<PermissionRule, HashPermissionRule>;