go: re-do the entire thing

This is a mega-change, but attempting to split this up further is
probably not worth the effort.

Summary:

1. Bump up bazel, rules_go, and others.
2. Switch to new go target naming (bye bye go_default_library)
3. Move go deps to go.mod/go.sum, use make gazelle generate from that
4. Bump up Python deps a bit

And also whatever was required to actually get things to work - loads of
small useless changes.

Tested to work on NixOS and Ubuntu 20.04:

   $ bazel build //...
   $ bazel test //...

Change-Id: I8364bdaa1406b9ae4d0385a6b607f3e7989f98a9
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1583
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/app/matrix/wellknown/BUILD b/app/matrix/wellknown/BUILD
index b44ac52..88bf967 100644
--- a/app/matrix/wellknown/BUILD
+++ b/app/matrix/wellknown/BUILD
@@ -2,35 +2,35 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library", "go_test")
 
 go_library(
-    name = "go_default_library",
+    name = "wellknown_lib",
     srcs = ["main.go"],
     importpath = "code.hackerspace.pl/hscloud/app/matrix/wellknown",
     visibility = ["//visibility:private"],
     deps = [
-        "//go/mirko:go_default_library",
-        "@com_github_golang_glog//:go_default_library",
+        "//go/mirko",
+        "@com_github_golang_glog//:glog",
     ],
 )
 
 go_binary(
     name = "wellknown",
-    embed = [":go_default_library"],
+    embed = [":wellknown_lib"],
     visibility = ["//visibility:public"],
 )
 
 go_test(
-    name = "go_default_test",
+    name = "wellknown_test",
     srcs = ["server_test.go"],
-    embed = [":go_default_library"],
-    deps = ["@com_github_go_test_deep//:go_default_library"],
+    embed = [":wellknown_lib"],
+    deps = ["@com_github_go_test_deep//:deep"],
 )
 
 container_layer(
     name = "layer_bin",
+    directory = "/app/matrix/",
     files = [
         ":wellknown",
     ],
-    directory = "/app/matrix/",
 )
 
 container_image(
@@ -43,8 +43,8 @@
 
 container_push(
     name = "push",
-    image = ":runtime",
     format = "Docker",
+    image = ":runtime",
     registry = "registry.k0.hswaw.net",
     repository = "q3k/wellknown",
     tag = "{BUILD_TIMESTAMP}-{STABLE_GIT_COMMIT}",