🐛 Fix runner config filenames, cache-server, and registration log 🐛

Three more bugs found during full component verification:
1. RUNNER_CONFIG_DEFAULT pointed to config.yaml but the actual
template filename is default_config.yaml — gitea named runner
never registered because the file-existence check always failed.
2. CACHE_CONFIG_FILE pointed to cache.yaml but the actual template
filename is cache_server.yaml — cache-server launch always
skipped silently.
3. act_runner v1.0.6 requires cache.external_secret on both the
cache-server and any runner using external_server; neither config
had it, so cache-server exited immediately and runner registration
failed when external_server was present in default_config.yaml.
4. Registration log redirect was 2>/dev/stdout >>"$log" (stderr went
to original stdout, not the log); corrected to >>"$log" 2>&1.
- rootfs/usr/local/etc/docker/init.d/zz-act_runner.sh:
- RUNNER_CONFIG_DEFAULT: config.yaml → default_config.yaml
- CACHE_CONFIG_FILE: cache.yaml → cache_server.yaml
- fix registration log redirect: >>"$RUNNER_LOG_FILE" 2>&1
- rootfs/tmp/etc/act_runner/default_config.yaml: remove
external_server (no shared secret configured; each runner uses
its own internal cache)
- rootfs/tmp/etc/act_runner/cache_server.yaml: set enabled: false
(cache-server requires external_secret; disabled until a proper
shared-secret setup is added)
Verified: 6 daemons on fresh start (1 gitea named + 5 runners), all
with 22 labels; clean reconnect on restart with no re-registration.

rootfs/tmp/etc/act_runner/cache_server.yaml
rootfs/tmp/etc/act_runner/default_config.yaml
rootfs/usr/local/etc/docker/init.d/zz-act_runner.sh

rootfs/tmp/etc/act_runner/cache_server.yaml

@@ -2,7 +2,7 @@ log:
   level: warn
 
 cache:
-  enabled: true
+  enabled: false
   dir: 'REPLACE_RUNNER_CACHE_DIR'
   host: '0.0.0.0'
   port: REPLACE_RUNNER_CACHE_PORT

rootfs/tmp/etc/act_runner/default_config.yaml

@@ -67,4 +67,3 @@ container:
 
 cache:
   enabled: true
-  external_server: 'http://REPLACE_RUNNER_CACHE_HOST:REPLACE_RUNNER_CACHE_PORT/'

rootfs/usr/local/etc/docker/init.d/zz-act_runner.sh

@@ -264,13 +264,13 @@ RUNNER_LABELS+="act_runner:docker://catthehacker/ubuntu:full-latest,"
 RUNNER_LABELS+="ubuntu-latest:docker://catthehacker/ubuntu:full-latest"
 # - - - - - - - - - - - - - - - - - - - - - - - - -
 RUNNER_IP_ADDRESS="${RUNNER_IP_ADDRESS:-$IP4_ADDRESS}"
-RUNNER_CONFIG_DEFAULT="${RUNNER_CONFIG_DEFAULT:-$ETC_DIR/config.yaml}"
+RUNNER_CONFIG_DEFAULT="${RUNNER_CONFIG_DEFAULT:-$ETC_DIR/default_config.yaml}"
 RUNNER_DEFAULT_HOME="${RUNNER_DEFAULT_HOME:-$CONF_DIR/gitea}"
 RUNNER_CONFIG_NAME="${RUNNER_CONFIG_NAME:-act_runner.yaml}"
 RUNNER_LOG_FILE="${RUNNER_LOG_FILE:-$LOG_DIR/register.log}"
 RUNNER_DAEMON_LOG="${RUNNER_DAEMON_LOG:-$LOG_DIR/daemon.log}"
 RUNNER_CACHE_HOST="${RUNNER_CACHE_HOST:-$IP4_ADDRESS}"
-CACHE_CONFIG_FILE="${CACHE_CONFIG_FILE:-$ETC_DIR/cache.yaml}"
+CACHE_CONFIG_FILE="${CACHE_CONFIG_FILE:-$ETC_DIR/cache_server.yaml}"
 CACHE_LOG_FILE="${CACHE_LOG_FILE:-$LOG_DIR/cache.log}"
 # - - - - - - - - - - - - - - - - - - - - - - - - -
 # Additional variables
@@ -349,7 +349,7 @@ __run_pre_execute_checks() {
 				__replace "REPLACE_RUNNER_HOME" "$RUNNER_DEFAULT_HOME" "$RUNNER_DEFAULT_HOME/$RUNNER_CONFIG_NAME"
 				__replace "REPLACE_RUNNER_CACHE_HOST" "$RUNNER_CACHE_HOST" "$RUNNER_DEFAULT_HOME/$RUNNER_CONFIG_NAME"
 				__replace "REPLACE_RUNNER_CACHE_PORT" "$RUNNER_CACHE_PORT" "$RUNNER_DEFAULT_HOME/$RUNNER_CONFIG_NAME"
-				act_runner register --config "$RUNNER_DEFAULT_HOME/$RUNNER_CONFIG_NAME" --labels "$RUNNER_LABELS" --name "gitea" --instance "http://$RUNNER_IP_ADDRESS:$GITEA_PORT" --token "$SYS_AUTH_TOKEN" --no-interactive 2>/dev/stdout >>"$RUNNER_LOG_FILE" &
+				act_runner register --config "$RUNNER_DEFAULT_HOME/$RUNNER_CONFIG_NAME" --labels "$RUNNER_LABELS" --name "gitea" --instance "http://$RUNNER_IP_ADDRESS:$GITEA_PORT" --token "$SYS_AUTH_TOKEN" --no-interactive >>"$RUNNER_LOG_FILE" 2>&1 &
 				echo $! >"$RUN_DIR/act_runner.gitea.pid"
 			fi
 		fi