fix: use correct path to toolcache (#1494)

The toolcache on GitHub Actions need to be in
/opt/hostedtoolcache. This is the case for all
environment variables set by act, but it's not the
case for the volume mounted into the container.

Co-authored-by: Björn Brauer <zaubernerd@zaubernerd.de>
Co-authored-by: ChristopherHX <christopher.homberger@web.de>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/runner/run_context.go

@@ -135,7 +135,7 @@ func (rc *RunContext) GetBindsAndMounts() ([]string, map[string]string) {
 	ext := container.LinuxContainerEnvironmentExtensions{}
 
 	mounts := map[string]string{
-		"act-toolcache": "/toolcache",
+		"act-toolcache": "/opt/hostedtoolcache",
 		name + "-env":   ext.GetActPath(),
 	}