fix: initialize Vertex ADC in LiteLLM container

servers/bwh-hk-dc3/litellm/compose.yaml

@@ -1,40 +1,25 @@
 services:
-  adc-init:
-    image: alpine:3.22
-    restart: "no"
-    environment:
-      GOOGLE_ADC_B64: ${GOOGLE_ADC_B64}
-    volumes:
-      - google-adc:/credentials
-    command:
-      - /bin/sh
-      - -c
-      - |
-        umask 077
-        printf '%s' "$${GOOGLE_ADC_B64}" | base64 -d > /credentials/application_default_credentials.json
-
   litellm:
     image: ghcr.io/berriai/litellm:main-stable
     restart: unless-stopped
-    depends_on:
-      adc-init:
-        condition: service_completed_successfully
     ports:
       - "${LISTEN_IP:-127.0.0.1}:${HOST_PORT:-4000}:4000"
     environment:
-      GOOGLE_APPLICATION_CREDENTIALS: /credentials/application_default_credentials.json
+      GOOGLE_ADC_B64: ${GOOGLE_ADC_B64}
+      GOOGLE_APPLICATION_CREDENTIALS: /tmp/application_default_credentials.json
       VERTEXAI_PROJECT: ${VERTEXAI_PROJECT}
       VERTEXAI_LOCATION: ${VERTEXAI_LOCATION:-global}
       LITELLM_MASTER_KEY: ${LITELLM_MASTER_KEY}
     volumes:
       - ./config.yaml:/app/config.yaml:ro
-      - google-adc:/credentials:ro
-    command: ["--config", "/app/config.yaml", "--host", "0.0.0.0", "--port", "4000"]
+    entrypoint: ["/bin/sh", "-c"]
+    command:
+      - |
+        umask 077
+        printf '%s' "$${GOOGLE_ADC_B64}" | base64 -d > /tmp/application_default_credentials.json
+        exec litellm --config /app/config.yaml --host 0.0.0.0 --port 4000
     logging:
       driver: json-file
       options:
         max-size: 1m
         max-file: "2"
-
-volumes:
-  google-adc: