resolver: Use a temporary working copy of the repository with gomod

gomod has been the only backend that prevented us from using a
temporary working copy of the input repository with all package manager
backends. The reason for that was the existence of the:
    * '--gomod-vendor'
    * '--gomod-vendor-check', and
    * '--force-gomod-tidy'
CLI flags that allowed the source repository to be dirtied by us. With
all of those flags now deprecated (treating them as NOOP) we can use a
temporary repository copy with gomod as well.

Resolves: containerbuildsystem#707

Signed-off-by: Erik Skultety <[email protected]>

cachi2/core/resolver.py

@@ -39,7 +39,7 @@ def resolve_packages(request: Request) -> RequestOutput:
     This function performs the operations in a working copy of the source directory in case
     a package manager that can make unwanted modifications will be used.
     """
-    if request.yarn_packages or request.yarn_classic_packages:
+    if request.yarn_packages or request.yarn_classic_packages or request.gomod_packages:
         original_source_dir = request.source_dir
 
         with TemporaryDirectory(".cachi2-source-copy", dir=".") as temp_dir: