CI: Fix uv install and MinIO networking

Install uv via official installer script instead of pip (pip not
available in the runner environment). Add ~/.local/bin to GITHUB_PATH
so uv is on PATH for subsequent steps.

MinIO: replace -p 9000:9000 (binds to host, unreachable from job
container) with --network container:$(hostname) which joins MinIO to
the job container's network namespace, making localhost:9000 resolve
correctly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/pipeline.yml

@@ -69,7 +69,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install uv
-        run: pip install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
 
       - name: Cache uv store
         uses: actions/cache@v3
@@ -104,7 +106,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Run Ruff
-        run: pip install uv && uvx ruff check .
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          ~/.local/bin/uvx ruff check .
         working-directory: api
 
   api-integration:
@@ -130,9 +134,9 @@ jobs:
       - name: Start MinIO
         run: |
           docker run -d --name ci-minio \
+            --network container:$(hostname) \
             -e MINIO_ROOT_USER=minioadmin \
             -e MINIO_ROOT_PASSWORD=minioadmin \
-            -p 9000:9000 \
             quay.io/minio/minio server /data
 
       - name: Create MinIO bucket
@@ -143,7 +147,9 @@ jobs:
           /tmp/mc mb local/reactbin-test
 
       - name: Install uv
-        run: pip install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
 
       - name: Cache uv store
         uses: actions/cache@v3