fix: Build all required binaries in Docker image (worker, workflow-runner, starter)

Dockerfile

@@ -5,16 +5,14 @@ COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
 
-# Re-use CI-built binary if present, otherwise build
-ARG BINARY_PATH=
-RUN if [ -n "$BINARY_PATH" ] && [ -f "$BINARY_PATH" ]; then \
-      cp "$BINARY_PATH" worker; \
-    else \
-      CGO_ENABLED=0 GOOS=linux go build -o worker ./cmd/worker; \
-    fi
+# Build all binaries
+RUN CGO_ENABLED=0 GOOS=linux go build -o worker ./cmd/worker && \
+    CGO_ENABLED=0 GOOS=linux go build -o poimen-workflow-runner ./cmd/workflow-runner && \
+    CGO_ENABLED=0 GOOS=linux go build -o poimen-worker ./cmd/starter
 
 FROM alpine:3.20
 RUN apk --no-cache add ca-certificates
 WORKDIR /app
 COPY --from=builder /app/worker .
-ENTRYPOINT ["./worker"]
+COPY --from=builder /app/poimen-workflow-runner .
+COPY --from=builder /app/poimen-worker .