Add .use_mise to use mise in CI

Author: burmudar

.buildkite/hooks/asdf-pre-command

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -eu
+pushd "$(dirname "${BASH_SOURCE[0]}")"/../..
+
+WORKDIR=$(pwd)
+
+echo "Installing asdf dependencies as defined in '${WORKDIR}/.tool-versions':"
+asdf install

.buildkite/hooks/pre-command

@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
+# Skip the rest if this is pipeline upload or empty
+if [[ "${BUILDKITE_COMMAND:-}" =~ "buildkite-agent pipeline upload".* ]]; then
+  exit 0
+elif [[ "${BUILDKITE_COMMAND:-}" = "" ]]; then
+  exit 0
+fi
 
-set -eu
-pushd "$(dirname "${BASH_SOURCE[0]}")"/../..
-
-WORKDIR=$(pwd)
-
-echo "Installing asdf dependencies as defined in '${WORKDIR}/.tool-versions':"
-asdf install
+if [ ! -f .use_mise ]; then
+  source ./asdf-pre-command
+fi

.use_mise

@@ -0,0 +1,6 @@
+Stateless CI agents use the presence of this file to determine whether it should install tools with mise or install them with ASDF.
+Thus if you delete this file, CI will use ASDF to install tools and not mise.
+
+The file is only meant to be here while we transition to using mise completely.
+
+For more information you can reach out to the dev-infra team on #discuss-dev-infra.