fix: another way of solving the issue may be

Author: aldbr

.github/workflows/basic.yml

@@ -169,48 +169,39 @@ jobs:
           fetch-depth: 0
           repository: DIRACGrid/diracx
           path: diracx
+      # Install the diracx envs first so that pixi 0.68's build_dispatch has
+      # a conda env (with pixi-build-python's uv) available when the subsequent
+      # `pixi add` re-solves PyPI source deps. Without this, build_dispatch
+      # panics with "installation of conda environment is required to solve
+      # PyPI source dependencies but `--no-install` flag has been set".
       - uses: prefix-dev/setup-pixi@v0.9.3
         with:
-          run-install: false
           post-cleanup: false
+          manifest-path: diracx/pixi.toml
+          environments: >-
+            diracx-core
+            diracx-db
+            diracx-logic
+            diracx-routers
+            diracx-client
+            diracx-api
+            diracx-cli
       - name: Apply workarounds
         run: |
           cd diracx
           # Workaround for https://github.com/prefix-dev/pixi/issues/3762
           sed -i.bak 's@editable = true@editable = false@g' pixi.toml
           rm pixi.toml.bak
-          # Inject the local DIRAC/DIRACCommon clones (and the GHA annotations
-          # plugin) as test-time pypi deps. We edit pixi.toml directly rather
-          # than via `pixi add`: that command has no --environment scope, so
-          # mutating the diracx-core feature ripples to every env using it,
-          # including gubbins. Gubbins is unnecessary for this job and brittle
-          # on pixi 0.68.x (build-dispatch panics).
-          python3 - <<PYEOF
-          import os, re
-          pwd = os.environ["PWD"]
-          addition = (
-              f'DIRACCommon = {{ path = "{pwd}/../DIRAC/dirac-common", editable = false }}\n'
-              f'DIRAC = {{ path = "{pwd}/../DIRAC", editable = false }}\n'
-              f'pytest-github-actions-annotate-failures = "*"\n'
-          )
-          text = open("pixi.toml").read()
-          new_text, n = re.subn(
-              r"(\[feature\.diracx-core\.pypi-dependencies\]\s*\n)",
-              r"\1" + addition,
-              text, count=1,
-          )
-          assert n == 1, "Could not find [feature.diracx-core.pypi-dependencies] section"
-          open("pixi.toml", "w").write(new_text)
-          PYEOF
+          # Add annotations to github actions
+          pixi add --pypi --feature diracx-core pytest-github-actions-annotate-failures
+          # Add the current DIRAC clone to the pixi.toml
+          pixi add --pypi --feature diracx-core 'DIRACCommon @ file://'$PWD'/../DIRAC/dirac-common'
+          pixi add --pypi --feature diracx-core 'DIRAC @ file://'$PWD'/../DIRAC'
           # Show any changes
           git diff
       - uses: prefix-dev/setup-pixi@v0.9.3
         with:
           cache: false
-          # We edit pixi.toml above without regenerating pixi.lock, so the
-          # committed lockfile is stale relative to the working manifest by
-          # construction. Let pixi regenerate it during install.
-          locked: false
           manifest-path: diracx/pixi.toml
           environments: >-
             diracx-core