busybox-static for healthchecks; alloy: rely on the default UI listener

- alpine's /bin/busybox is musl-dynamic and cannot execute in the
  distroless loki image (missing loader); busybox-static links in
- alloy 1.x refuses to configure the ui service from a config block;
  the default UI already listens on 127.0.0.1:12345 where the
  healthcheck probes

dankclaw/alloy/Containerfile

@@ -9,7 +9,10 @@
 #   podman build -t franksdank/alloy:latest -f dankclaw/alloy/Containerfile .
 
 FROM docker.io/library/alpine:latest AS tools
-# busybox provides wget for the healthcheck.
+# busybox-static is statically linked: the target images have no dynamic
+# loader (loki is distroless), so the alpine default /bin/busybox (musl
+# dynamic) would fail with "no such file or directory".
+RUN apk add --no-cache busybox-static
 
 FROM docker.io/grafana/alloy:latest
 COPY --from=tools /bin/busybox /usr/local/bin/busybox

dankclaw/loki/Containerfile

@@ -9,7 +9,10 @@
 #   podman build -t franksdank/loki:latest -f dankclaw/loki/Containerfile .
 
 FROM docker.io/library/alpine:latest AS tools
-# busybox provides wget for the healthcheck.
+# busybox-static is statically linked: the target images have no dynamic
+# loader (loki is distroless), so the alpine default /bin/busybox (musl
+# dynamic) would fail with "no such file or directory".
+RUN apk add --no-cache busybox-static
 
 FROM docker.io/grafana/loki:latest
 COPY --from=tools /bin/busybox /usr/local/bin/busybox

shared/alloy/config.alloy

@@ -5,12 +5,9 @@ logging {
   level = "info"
 }
 
-// Local listener so the container healthcheck can probe us.
+// The alloy UI service listens on 127.0.0.1:12345 by default; the
-// Alloy >= 1.0 renamed the server component to ui.
+// in-container healthcheck probes it there. alloy 1.x refuses to
-ui {
+// configure the ui service from a config block, so there is no block.
-  host = "0.0.0.0"
-  port = 12345
-}
 
 // Ship logs to Loki (container name on the podman network).
 loki.write "default" {

tests/caddyfile.bats

@@ -158,7 +158,9 @@ CADDYFILE="$REPO_ROOT/dankclaw/Caddyfile"
     [ "$n" -ge 2 ] || { echo "expected >=2 busybox healthchecks, found $n"; return 1; }
 }
 
-@test "alloy config uses the ui component (the server component was renamed)" {
+@test "alloy config declares no ui/server block (default UI listens on 127.0.0.1:12345)" {
-    grep -qE '^ui \{' "$REPO_ROOT/shared/alloy/config.alloy"
+    # alloy 1.x refuses to configure the ui service from a config block
-    ! grep -qE '^server \{' "$REPO_ROOT/shared/alloy/config.alloy"
+    # ("service ui does not support being configured"). The default UI
+    # already listens where the in-container healthcheck probes.
+    ! grep -qE '^(ui|server) \{' "$REPO_ROOT/shared/alloy/config.alloy"
 }