ci: rename copilot-setup workflow to copilot-setup-steps and follow standard pattern

Co-authored-by: Belphemur <197810+Belphemur@users.noreply.github.com>

.github/workflows/copilot-setup-steps.yml

@@ -0,0 +1,79 @@
+name: Copilot Setup Steps
+permissions:
+  contents: read
+
+on:
+  workflow_dispatch:
+
+jobs:
+  copilot-setup-steps:
+    name: Setup Go and gopls
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Verify Go installation
+        run: |
+          go version
+          go env
+
+      - name: Install gopls
+        run: |
+          go install golang.org/x/tools/gopls@latest
+
+      - name: Verify gopls installation
+        run: |
+          gopls version
+
+      - name: Install golangci-lint
+        uses: golangci/golangci-lint-action@v9
+        with:
+          version: latest
+
+      - name: Download Go dependencies
+        run: |
+          go mod download
+          go mod verify
+
+      - name: Build encoder-setup utility
+        run: |
+          go build -tags encoder_setup -o encoder-setup ./cmd/encoder-setup
+          ls -lh encoder-setup
+
+      - name: Run encoder-setup
+        run: |
+          ./encoder-setup
+
+      - name: Build application
+        run: |
+          go build -o cbzconverter ./cmd/cbzoptimizer
+
+      - name: Verify build
+        run: |
+          ls -lh cbzconverter
+          file cbzconverter
+
+      - name: Install gotestsum
+        run: |
+          go install gotest.tools/gotestsum@latest
+
+      - name: Verify gotestsum installation
+        run: |
+          gotestsum --version
+
+      - name: Setup complete
+        run: |
+          echo "✅ Go environment setup complete"
+          echo "✅ gopls (Go language server) installed"
+          echo "✅ golangci-lint installed"
+          echo "✅ Dependencies downloaded and verified"
+          echo "✅ WebP encoder configured (libwebp 1.6.0)"
+          echo "✅ Application built successfully"
+          echo "✅ gotestsum (test runner) installed"