move patchelf install

Dockerfile.build-musl

@@ -12,7 +12,7 @@ WORKDIR /app
 RUN \
   --mount=type=cache,target=/var/cache/apk,sharing=shared \
   apk update && \
-  apk add git curl binutils gcc libc-dev libffi-dev zlib-dev openssl-dev tzdata bash patchelf python3-dev musl-dev pkgconfig cargo
+  apk add git curl binutils gcc libc-dev libffi-dev zlib-dev openssl-dev tzdata bash python3-dev musl-dev pkgconfig cargo
 # from https://cryptography.io/en/latest/installation/#building-cryptography-on-linux
 # If you get an error with openssl-dev you may have to use libressl-dev.
 # cargo 
@@ -39,6 +39,15 @@ COPY pyproject.toml .
 COPY src src/
 # staticx must be installed after scons
 # staticx gives error: Error relocating /tmp/staticx-pyi-9b5nvfi_/_cffi_backend.cpython-312-x86_64-linux-musl.so: PyNumber_Long: symbol not found, so not using for musl
+# cryptography build on arm32v7 is hanging with patchelf present, so doing separate steps
+RUN \
+    --mount=type=cache,target=/root/.cache/pip,sharing=shared \
+    python3 -m venv .venv && \
+    . .venv/bin/activate && \
+    pip3 install --disable-pip-version-check cryptography
+RUN \
+    --mount=type=cache,target=/var/cache/apk,sharing=shared \
+    apk add patchelf
 RUN \
     --mount=type=cache,target=/root/.cache/pip,sharing=shared \
     python3 -m venv .venv && \