Add preliminary CI scripts

.ci/check-format.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+set -e -u -o pipefail
+
+SOURCES=$(find $(git rev-parse --show-toplevel) | egrep "\.(c|cxx|cpp|h|hpp)\$")
+
+set -x
+
+for file in ${SOURCES};
+do
+    clang-format-18 ${file} > expected-format
+    diff -u -p --label="${file}" --label="expected coding style" ${file} expected-format
+done
+exit $(clang-format-18 --output-replacements-xml ${SOURCES} | egrep -c "</replacement>")

.ci/check-newline.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -e -u -o pipefail
+
+ret=0
+show=0
+# Reference: https://medium.com/@alexey.inkin/how-to-force-newline-at-end-of-files-and-why-you-should-do-it-fdf76d1d090e
+while IFS= read -rd '' f; do
+    if file --mime-encoding "$f" | grep -qv binary; then
+        tail -c1 < "$f" | read -r _ || show=1
+        if [ $show -eq 1 ]; then
+            echo "Warning: No newline at end of file $f"
+            ret=1
+            show=0
+        fi
+    fi
+done < <(git ls-files -z src tests/arch-test-target)
+
+exit $ret

.github/workflows/main.yml

@@ -0,0 +1,16 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  coding-style:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: coding convention
+        run: |
+          sudo apt-get update
+          sudo apt-get install -q -y clang-format-18
+          .ci/check-newline.sh
+          .ci/check-format.sh
+        shell: bash