Install Conan manually for CentOS 7 with uv Python

The get-conan action uses pip3 from the system Python, which installs
conan to /usr/local/bin. On CentOS 7, this means the old system conan
at /usr/bin takes precedence.

Changes:
- Move 'Fix PATH for local tools' to the top, before all setup steps
- Install Conan manually for vfx2021/vfx2022 using python3.11 -m pip
  This ensures conan gets installed to ~/.local/bin with uv Python
- Keep get-conan action for other platforms (vfx2023, Ubuntu, macOS, Windows)

This ensures both Python 3.11 and Conan 2.x are in ~/.local/bin, which
is now first in PATH, so they're found before system versions.

Signed-off-by: Gary Oberbrunner <[email protected]>

Author: garyo

.github/workflows/build.yml

@@ -189,6 +189,12 @@ jobs:
           fi
           echo "RELEASE_NAME=${RELEASE_PREFIX}-${REF_SUFFIX}${OPENGL_BUILD}" >> $GITHUB_ENV
 
+      # Ensure ~/.local/bin is first in PATH for all local tools (uv, python, pip, conan)
+      # This is especially important for old CentOS 7 containers with old system versions
+      - name: Fix PATH for local tools
+        run: |
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+
       - name: Set up python 3.11
         uses: actions/setup-python@v5
         if: matrix.ostype == 'mac'
@@ -217,18 +223,21 @@ jobs:
           echo -n 'python symlink target: ' && (readlink -f $(which python) || echo "not a symlink")
           echo -n 'which uv: ' && (which uv || echo "No uv; continuing")
 
+      # Install Conan manually for old CentOS 7 using uv-installed Python
+      # The get-conan action doesn't know about uv Python and would use system Python
+      - name: Install Conan manually (CentOS 7)
+        if: matrix.vfx-cy == 2021 || matrix.vfx-cy == 2022
+        run: |
+          python3.11 -m pip install --user conan==${{ matrix.conan_version }}
+
+      # Use get-conan action for other platforms
       - name: Install Conan
         id: conan
+        if: matrix.vfx-cy != 2021 && matrix.vfx-cy != 2022
         uses: turtlebrowser/get-conan@main
         with:
           version: ${{ matrix.conan_version }}
 
-      # Ensure ~/.local/bin is first in PATH for uv-installed Python and pip-installed Conan
-      # This is especially important for old CentOS 7 containers with old system python/conan
-      - name: Fix PATH for local tools
-        run: |
-          echo "$HOME/.local/bin" >> $GITHUB_PATH
-
       - name: Set up conan
         run: |
           which conan