modify dockerfile builder image so it can run tests

Add missing files that prevented the `go test` from passing.
This enables local testing, including testing that uses internet and
runs a production-like scenarios.
The tests can be run with:
```
docker run --cap-add=SYS_ADMIN  -it builder-image go test -v ./... \
-tags="privileged containerized"
```

Dockerfile

@@ -25,6 +25,8 @@ COPY ./testutil/ testutil/
 COPY ./manifest/ manifest/
 COPY ./dnfconfig/ dnfconfig/
 COPY ./srcconfig/ srcconfig/
+COPY ./configfiles/ configfiles/
+COPY ./pki /pki
 RUN go mod download && go build -o /usr/bin/eext
 
 FROM base as deploy