ci: resolve Python from persistent toolcache, bypass setup-python download

.gitea/workflows/ci.yml

@@ -32,21 +32,25 @@ jobs:
             echo "uv not found in toolcache"
           fi
 
+      - name: Enable Python from toolcache
+        id: py
+        run: |
+          py_bin="$(find /opt/hostedtoolcache/Python -maxdepth 4 -type f -name 'python3*' -perm -111 2>/dev/null | grep -v -- '-config$' | head -1)"
+          if [ -n "$py_bin" ]; then
+            dirname "$py_bin" >> "$GITHUB_PATH"
+            echo "found=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "python not found in toolcache"
+          fi
+
       - name: Install uv
         if: steps.uv.outputs.found != 'true'
         uses: astral-sh/setup-uv@v3
         with:
           enable-cache: true
 
-      - name: Cache Python toolchain
-        uses: actions/cache@v4
-        with:
-          path: /opt/hostedtoolcache/Python
-          key: python-${{ matrix.python-version }}-${{ runner.os }}
-          restore-keys: |
-            python-${{ matrix.python-version }}-
-
       - name: Set up Python ${{ matrix.python-version }}
+        if: steps.py.outputs.found != 'true'
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
@@ -95,21 +99,25 @@ jobs:
             echo "uv not found in toolcache"
           fi
 
+      - name: Enable Python from toolcache
+        id: py
+        run: |
+          py_bin="$(find /opt/hostedtoolcache/Python -maxdepth 4 -type f -name 'python3*' -perm -111 2>/dev/null | grep -v -- '-config$' | head -1)"
+          if [ -n "$py_bin" ]; then
+            dirname "$py_bin" >> "$GITHUB_PATH"
+            echo "found=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "python not found in toolcache"
+          fi
+
       - name: Install uv
         if: steps.uv.outputs.found != 'true'
         uses: astral-sh/setup-uv@v3
         with:
           enable-cache: true
 
-      - name: Cache Python toolchain
-        uses: actions/cache@v4
-        with:
-          path: /opt/hostedtoolcache/Python
-          key: python-3.13-${{ runner.os }}
-          restore-keys: |
-            python-3.13-
-
       - name: Set up Python
+        if: steps.py.outputs.found != 'true'
         uses: actions/setup-python@v5
         with:
           python-version: "3.13"