fix: Dockerfile pin V to 0.5.2 commit (not latest)

V latest (git clone --depth 1) has incompatible APIs with
the source code written for V 0.5.2. Pin to exact commit
45ae01d to match local dev environment.

Dockerfile

@@ -3,9 +3,10 @@ FROM alpine:3.20 AS builder
 
 RUN apk add --no-cache gcc musl-dev git make
 
-# Build V from source
-RUN git clone --depth 1 https://github.com/vlang/v /opt/v
+# Build V from source, pinned to V 0.5.2 commit
+RUN git clone https://github.com/vlang/v /opt/v
 WORKDIR /opt/v
+RUN git checkout 45ae01d23168b6372f734eeb38a77360bbcf184a
 RUN make
 
 # Copy project source and build
@@ -16,7 +17,7 @@ RUN /opt/v/v -prod -o /ntfy-bridge .
 # ── Runtime stage: minimal image ───────────────────────────────────────────
 FROM alpine:3.20
 
-RUN apk add --no-cache ca-certificates tzdata
+RUN apk add --no-cache ca-certificates tzdata curl
 COPY --from=builder /ntfy-bridge /usr/local/bin/ntfy-bridge
 
 WORKDIR /etc/ntfy-bridge