build base images for torch 2.7.1 (#2764)

* build base images for torch 2.7.1

* fix: update base docker to use torch 2.7.1

* fix: update doc for main base to use 2.7.1

* make sure to install fa2 in base uv too

* use no build isolation for uv+flashattn

* install psutil also for fa2

* longer timeout for flash attn build

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Co-authored-by: NanoCode012 <nano@axolotl.ai>

docker/Dockerfile-base

@@ -38,6 +38,6 @@ RUN git lfs install --skip-repo && \
     # The base image ships with `pydantic==1.8.2` which is not working
     pip3 install -U --no-cache-dir pydantic==1.10.10
 
-RUN if [ "$PYTORCH_VERSION" = "2.7.0" ] ; then \
+RUN if [ "$PYTORCH_VERSION" = "2.7.1" ] ; then \
         pip3 install flash-attn==2.7.4.post1; \
     fi