chore: remove the leftovers of the act runner deployment

`scripts/act_runner/token.sh` bootstrapped the registration token of an act runner by patching a Kubernetes Secret
with kubectl. The deployment it belonged to is long gone, and no glob picked the file up either: the chart only ships
`scripts/init-containers/config/*.sh` and `scripts/init-containers/init/*.sh`, so the script was not even part of the
packaged chart.

The label helpers `gitea.labels.actRunner` and `gitea.selectorLabels.actRunner` were orphaned the same way. The former
is referenced by no template at all and the latter only by the former, which left them as a closed loop without an
entry point.

Co-authored-by: Copilot <copilot@github.com>

scripts/act_runner/token.sh

@@ -1,43 +0,0 @@
-#!/bin/sh
-
-set -eu
-
-timeout_delay=15
-
-check_token() {
-  set +e
-
-  echo "Checking for existing token..."
-  token="$(kubectl get secret "$SECRET_NAME" -o jsonpath="{.data['token']}" 2> /dev/null)"
-  [ $? -ne 0 ] && return 1
-  [ -z "$token" ] && return 2
-  return 0
-}
-
-create_token() {
-  echo "Waiting for new token to be generated..."
-  begin=$(date +%s)
-  end=$((begin + timeout_delay))
-  while true; do
-    [ -f /data/actions/token ] && return 0
-    [ "$(date +%s)" -gt $end ] && return 1
-    sleep 5
-  done
-}
-
-store_token() {
-  echo "Storing the token in Kubernetes secret..."
-  kubectl patch secret "$SECRET_NAME" -p "{\"data\":{\"token\":\"$(base64 /data/actions/token | tr -d '\n')\"}}"
-}
-
-if check_token; then
-  echo "Key already in place, exiting."
-  exit
-fi
-
-if ! create_token; then
-  echo "Checking for an existing act runner token in secret $SECRET_NAME timed out after $timeout_delay"
-  exit 1
-fi
-
-store_token