ci: push base image al registry + parametrizza BASE_IMAGE nei service Dockerfile

Buildx con driver docker-container non vede image caricate nel daemon
locale. Soluzione: push base come git.tielogic.xyz/adriano/cerbero-mcp/
base:latest e i 6 service Dockerfile usano ${BASE_IMAGE}:${BASE_TAG}
con default "cerbero-base" per dev locale, override CI a path registry.

docker/mcp-alpaca.Dockerfile

@@ -1,6 +1,7 @@
+ARG BASE_IMAGE=cerbero-base
 ARG BASE_TAG=latest
 
-FROM cerbero-base:${BASE_TAG} AS builder
+FROM ${BASE_IMAGE}:${BASE_TAG} AS builder
 COPY services/mcp-alpaca ./services/mcp-alpaca
 RUN uv sync --frozen --no-dev --package mcp-alpaca
 

docker/mcp-bybit.Dockerfile

@@ -1,6 +1,7 @@
+ARG BASE_IMAGE=cerbero-base
 ARG BASE_TAG=latest
 
-FROM cerbero-base:${BASE_TAG} AS builder
+FROM ${BASE_IMAGE}:${BASE_TAG} AS builder
 COPY services/mcp-bybit ./services/mcp-bybit
 RUN uv sync --frozen --no-dev --package mcp-bybit
 

docker/mcp-deribit.Dockerfile

@@ -1,8 +1,9 @@
 # CER-P5-012 multi-stage slim: builder da cerbero-base (con uv + toolchain),
 # runtime da python:3.11-slim (solo venv + source).
+ARG BASE_IMAGE=cerbero-base
 ARG BASE_TAG=latest
 
-FROM cerbero-base:${BASE_TAG} AS builder
+FROM ${BASE_IMAGE}:${BASE_TAG} AS builder
 COPY services/mcp-deribit ./services/mcp-deribit
 RUN uv sync --frozen --no-dev --package mcp-deribit
 

docker/mcp-hyperliquid.Dockerfile

@@ -1,6 +1,7 @@
+ARG BASE_IMAGE=cerbero-base
 ARG BASE_TAG=latest
 
-FROM cerbero-base:${BASE_TAG} AS builder
+FROM ${BASE_IMAGE}:${BASE_TAG} AS builder
 COPY services/mcp-hyperliquid ./services/mcp-hyperliquid
 RUN uv sync --frozen --no-dev --package mcp-hyperliquid
 

docker/mcp-macro.Dockerfile

@@ -1,6 +1,7 @@
+ARG BASE_IMAGE=cerbero-base
 ARG BASE_TAG=latest
 
-FROM cerbero-base:${BASE_TAG} AS builder
+FROM ${BASE_IMAGE}:${BASE_TAG} AS builder
 COPY services/mcp-macro ./services/mcp-macro
 RUN uv sync --frozen --no-dev --package mcp-macro
 

docker/mcp-sentiment.Dockerfile

@@ -1,6 +1,7 @@
+ARG BASE_IMAGE=cerbero-base
 ARG BASE_TAG=latest
 
-FROM cerbero-base:${BASE_TAG} AS builder
+FROM ${BASE_IMAGE}:${BASE_TAG} AS builder
 COPY services/mcp-sentiment ./services/mcp-sentiment
 RUN uv sync --frozen --no-dev --package mcp-sentiment