Add Forgejo namespace workflow stack

.forgejo/workflows/build-apple.yml

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+name: Build Apple
+
+on:
+  pull_request:
+    branches:
+      - "**"
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build App (${{ matrix.platform }})
+    runs-on: namespace-profile-macos-large
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: macOS
+            destination: platform=macOS
+            rust-targets: x86_64-apple-darwin,aarch64-apple-darwin
+          - platform: iOS Simulator
+            destination: platform=iOS Simulator,name=iPhone 17 Pro
+            rust-targets: aarch64-apple-ios-sim,x86_64-apple-ios
+    env:
+      CARGO_INCREMENTAL: 0
+      RUST_BACKTRACE: short
+    steps:
+      - name: Checkout
+        uses: https://code.forgejo.org/actions/checkout@v4
+        with:
+          token: ${{ github.token }}
+          fetch-depth: 0
+          submodules: recursive
+
+      - name: Select Xcode
+        shell: bash
+        run: |
+          set -euo pipefail
+          candidates=(
+            "/Applications/Xcode_26.1.app/Contents/Developer"
+            "/Applications/Xcode_26_1.app/Contents/Developer"
+            "/Applications/Xcode.app/Contents/Developer"
+            "/Applications/Xcode/Xcode.app/Contents/Developer"
+          )
+          selected=""
+          for candidate in "${candidates[@]}"; do
+            if [[ -d "$candidate" ]]; then
+              selected="$candidate"
+              break
+            fi
+          done
+          if [[ -z "$selected" ]] && command -v xcode-select >/dev/null 2>&1; then
+            selected="$(xcode-select -p)"
+          fi
+          if [[ -z "$selected" ]]; then
+            echo "::error ::Unable to locate an Xcode toolchain" >&2
+            exit 1
+          fi
+          echo "DEVELOPER_DIR=$selected" >> "$GITHUB_ENV"
+          DEVELOPER_DIR="$selected" /usr/bin/xcodebuild -version || true
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.85.0
+          targets: ${{ matrix.rust-targets }}
+
+      - name: Install Protobuf
+        shell: bash
+        run: |
+          set -euo pipefail
+          if ! command -v protoc >/dev/null 2>&1; then
+            brew install protobuf
+          fi
+
+      - name: Build
+        shell: bash
+        working-directory: Apple
+        run: |
+          set -euo pipefail
+          xcodebuild build \
+            -project Burrow.xcodeproj \
+            -scheme App \
+            -destination '${{ matrix.destination }}' \
+            -skipPackagePluginValidation \
+            -skipMacroValidation \
+            -onlyUsePackageVersionsFromResolvedFile \
+            -clonedSourcePackagesDirPath SourcePackages \
+            -packageCachePath "$PWD/PackageCache" \
+            -derivedDataPath "$PWD/DerivedData" \
+            CODE_SIGNING_ALLOWED=NO \
+            CODE_SIGNING_REQUIRED=NO \
+            CODE_SIGN_IDENTITY="" \
+            DEVELOPMENT_TEAM=""

.forgejo/workflows/build-rust.yml

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+name: Build Rust
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - "**"
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  rust:
+    name: Cargo Test
+    runs-on: [self-hosted, linux, x86_64, burrow-forge]
+    steps:
+      - name: Checkout
+        uses: https://code.forgejo.org/actions/checkout@v4
+        with:
+          token: ${{ github.token }}
+          fetch-depth: 0
+
+      - name: Test
+        shell: bash
+        run: |
+          set -euo pipefail
+          nix develop .#ci -c cargo test --workspace --all-features

.forgejo/workflows/build-site.yml

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+name: Build Site
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - "**"
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  site:
+    name: Next.js Build
+    runs-on: [self-hosted, linux, x86_64, burrow-forge]
+    steps:
+      - name: Checkout
+        uses: https://code.forgejo.org/actions/checkout@v4
+        with:
+          token: ${{ github.token }}
+          fetch-depth: 0
+
+      - name: Build
+        shell: bash
+        run: |
+          set -euo pipefail
+          nix develop .#ci -c bash -lc 'cd site && npm install && npm run build'