Update README with detailed usage instructions; switch workflows to MiniServ-nix-runner

.gitea/workflows/build.yml

@@ -11,6 +11,8 @@ on:
 jobs:
   build:
     runs-on: nix
+    env:
+      CARGO_TARGET_DIR: target
 
     steps:
       - name: Checkout repository

.gitea/workflows/test.yml

@@ -6,11 +6,15 @@ on:
     branches:
       - main
       - master
+    tags:
+      - v*
   pull_request:
 
 jobs:
   test:
     runs-on: nix
+    env:
+      CARGO_TARGET_DIR: target
 
     steps:
       - name: Checkout repository
@@ -18,3 +22,27 @@ jobs:
 
       - name: Run tests (Nix dev shell)
         run: nix develop --extra-experimental-features "nix-command flakes" -c cargo test --verbose
+
+  publish:
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs: test
+    runs-on: nix
+    env:
+      CARGO_TARGET_DIR: target
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Configure Cargo registry (Gitea)
+        run: |
+          mkdir -p ~/.cargo
+          cat > ~/.cargo/config.toml << 'EOF'
+          [registries.gitea]
+          index = "sparse+https://git.moturpin.com/api/packages/Matsubaa/cargo/"
+          EOF
+
+      - name: Publish to Gitea Cargo registry
+        env:
+          CARGO_REGISTRIES_GITEA_TOKEN: ${{ secrets.CARGO_TOKEN }}
+        run: nix develop --extra-experimental-features "nix-command flakes" -c cargo publish --registry gitea --verbose