Make GitHub Actions cover compilation with 32bit Emscripten

.github/workflows/emscripten.yml

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+#                          __  __            _
+#                       ___\ \/ /_ __   __ _| |_
+#                      / _ \\  /| '_ \ / _` | __|
+#                     |  __//  \| |_) | (_| | |_
+#                      \___/_/\_\ .__/ \__,_|\__|
+#                               |_| XML parser
+#
+# Copyright (c) 2025 Sebastian Pipping <sebastian@pipping.org>
+# Licensed under the MIT license:
+#
+# Permission is  hereby granted,  free of charge,  to any  person obtaining
+# a  copy  of  this  software   and  associated  documentation  files  (the
+# "Software"),  to  deal in  the  Software  without restriction,  including
+# without  limitation the  rights  to use,  copy,  modify, merge,  publish,
+# distribute, sublicense, and/or sell copies of the Software, and to permit
+# persons  to whom  the Software  is  furnished to  do so,  subject to  the
+# following conditions:
+#
+# The above copyright  notice and this permission notice  shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,
+# EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+# NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+# DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+# USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+name: Build with Emscripten
+
+on:
+  pull_request:
+  push:
+  schedule:
+    - cron: '0 2 * * 5'  # Every Friday at 2am
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  emscripten:
+    name: Build with Emscripten
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+
+    - name: Install build dependencies
+      run: |-
+        set -x
+        sudo apt-get update
+        sudo apt-get install --yes --no-install-recommends -V \
+            cmake \
+            emscripten \
+            make
+
+    - name: Build using musl-tools
+      run: |
+        cmake_args=(
+          -DCMAKE_C_FLAGS='-O1 -pipe -Wall -Wextra -pedantic -Wno-overlength-strings'
+          -DCMAKE_CXX_FLAGS='-O2 -pipe -Wall -Wextra -pedantic -Wno-overlength-strings'
+          -DEXPAT_BUILD_DOCS=OFF
+          -DEXPAT_WARNINGS_AS_ERRORS=ON
+        )
+        set -x
+        emcmake cmake "${cmake_args[@]}" -S expat/ -B build/
+        emmake make -C build -j$(nproc) VERBOSE=1 all