build-support/docker: pass tlsVerify to support http registries

pkgs/build-support/docker/default.nix

@@ -86,6 +86,8 @@ rec {
     , finalImageName ? imageName
       # This used to set a tag to the pulled image
     , finalImageTag ? "latest"
+      # This is used to disable TLS certificate verification, allowing access to http registries on (hopefully) trusted networks
+    , tlsVerify ? true
 
     , name ? fixName "docker-image-${finalImageName}-${finalImageTag}.tar"
     }:
@@ -105,7 +107,13 @@ rec {
       sourceURL = "docker://${imageName}@${imageDigest}";
       destNameTag = "${finalImageName}:${finalImageTag}";
     } ''
-      skopeo --insecure-policy --tmpdir=$TMPDIR --override-os ${os} --override-arch ${arch} copy "$sourceURL" "docker-archive://$out:$destNameTag"
+      skopeo \
+        --src-tls-verify=${lib.boolToString tlsVerify} \
+        --insecure-policy \
+        --tmpdir=$TMPDIR \
+        --override-os ${os} \
+        --override-arch ${arch} \
+        copy "$sourceURL" "docker-archive://$out:$destNameTag"
     '';
 
   # We need to sum layer.tar, not a directory, hence tarsum instead of nix-hash.