fix: ensure git shell-out inherits environment variables

Custom environment variables such as those used to configure SSL cert
need to be inherited by git's processes in order to apply.

`cmd.Env` it not initialized to include the default env vars for the process.
In order to properly inherit the variables you have to use
`cmd.Environ()` to append to the default variables.

Author: aThorp96

pkg/resolution/resolver/git/repository.go

@@ -120,7 +120,7 @@ func (repo *repository) execGit(ctx context.Context, subCmd string, args ...stri
 		}
 	}
 	cmd := repo.executor(ctx, "git", append(configArgs, args...)...)
-	cmd.Env = append(cmd.Env, env...)
+	cmd.Env = append(cmd.Environ(), env...)
 
 	out, err := cmd.Output()
 	if err != nil {

pkg/resolution/resolver/git/repository_test.go

@@ -22,6 +22,7 @@ import (
 	"encoding/base64"
 	"os/exec"
 	"reflect"
+	"slices"
 	"testing"
 )
 
@@ -84,8 +85,15 @@ func TestClone(t *testing.T) {
 			if !reflect.DeepEqual(cmdParts, expectedCmd) {
 				t.Fatalf("Expected clone command to be %v but got %v", expectedCmd, cmdParts)
 			}
-			if !reflect.DeepEqual(cmd.Env, expectedEnv) {
-				t.Fatalf("Expected clone command env vars to be %v but got %v", expectedEnv, cmd.Env)
+
+			missingEnvVars := []string{}
+			for _, v := range expectedEnv {
+				if !slices.Contains(cmd.Environ(), v) {
+					missingEnvVars = append(missingEnvVars, v)
+				}
+			}
+			if len(missingEnvVars) > 0 {
+				t.Fatalf("Clone command missing env vars %v. Got: %v", missingEnvVars, cmd.Environ())
 			}
 		})
 	}