Hide --registry flags behind a config

Renovate scans for registry URLs in .bazelrc files and tries to use all of them, but it
does not support file: URLs and fails. However, it ignores any `--registry` values associated
with a configuration.

So introduce a `common` configuration which is always enabled, but causes renovate to
skip the `--registry` values.

.bazelrc.bzlmod

@@ -3,4 +3,5 @@ common --noenable_bzlmod
 
 common:bzlmod --enable_bzlmod
 # Note, have to use /// to make Bazel not crash on Windows
-common --registry=file:///%workspace%/registry --registry=https://bcr.bazel.build
+common:common --registry=file:///%workspace%/registry --registry=https://bcr.bazel.build
+

.bazelrc.common

@@ -3,6 +3,9 @@
 # Global Configuration
 # --------------------
 
+# enable common config by default (needed for renovate to ignore the file: registry)
+common --config common
+
 # Force TLS 1.2. With TLS 1.3, we run into the following error on Darwin.
 # > No subject alternative DNS name matching github-releases.githubusercontent.com found.
 # It looks like this is a result of SNI being broken on TLS 1.3 which results

examples/.bazelrc.bzlmod

@@ -1,2 +1,2 @@
 common:bzlmod --enable_bzlmod
-common --registry=file://%workspace%/../registry --registry=https://bcr.bazel.build
+common:common --registry=file://%workspace%/../registry --registry=https://bcr.bazel.build

rules_haskell_nix/.bazelrc.bzlmod

@@ -1,4 +1,4 @@
 common:bzlmod --enable_bzlmod
 
 # Note, have to use /// to make Bazel not crash on Windows
-common --registry=file:///%workspace%/../registry --registry=https://bcr.bazel.build
+common:common --registry=file:///%workspace%/../registry --registry=https://bcr.bazel.build

rules_haskell_tests/.bazelrc.bzlmod

@@ -4,4 +4,4 @@ common --noenable_bzlmod
 common:bzlmod --enable_bzlmod
 
 # Note, have to use /// to make Bazel not crash on Windows
-common --registry=file:///%workspace%/../registry --registry=https://bcr.bazel.build
+common:common --registry=file:///%workspace%/../registry --registry=https://bcr.bazel.build

tutorial/.bazelrc.bzlmod

@@ -1,2 +1,2 @@
 common:bzlmod --enable_bzlmod
-common --registry=file://%workspace%/../registry --registry=https://bcr.bazel.build
+common:common --registry=file://%workspace%/../registry --registry=https://bcr.bazel.build