Fixed multiple calls to get_latest_version

Author: smistad

.github/workflows/build_runtime_images.yaml

@@ -65,7 +65,8 @@ jobs:
             --build-arg TYPE=${{ matrix.type }} \
             --build-arg X_SERVER=${{ matrix.x_server }} \
             --build-arg OPENCL_PLATFORM=${{ matrix.opencl }} \
-            --build-arg VIRTUALGL=${{ matrix.vgl }}
+            --build-arg VIRTUALGL=${{ matrix.vgl }} \
+            --build-arg FAST_VERSION=$FAST_VERSION
 
       - name: Cache test data
         id: cache-test-dataset

runtime.Dockerfile

@@ -83,7 +83,8 @@ RUN if [ "${TYPE}" = "python" ]; then \
        python3 -m venv /environment && \
        source /environment/bin/activate && \
        pip install requests && \
-       pip install pyfast==$(python fast_version.py $FAST_VERSION); \
+       pip install pyfast==$(python fast_version.py $FAST_VERSION) && \
+       pip cache purge; \
    else \
        apt install -y python3 python3-pip python3-venv wget libopenslide0 &&\
        python3 -m venv /environment && \