feat: add CI workflow to lint and compile nginx on PRs

.github/workflows/ci.yml

@@ -0,0 +1,53 @@
+---
+name: "ci"
+
+# yamllint disable-line rule:truthy
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+  push:
+    branches:
+      - master
+      - main
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Run shellcheck
+        run: make test
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Download source tarballs
+        run: |
+          source "$GITHUB_WORKSPACE/conf/nginx-configure-flags"
+          cd /tmp
+          curl -sSL "https://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz" | tar xz
+          curl -sSL "https://github.com/PCRE2Project/pcre2/releases/download/pcre2-${PCRE_VERSION}/pcre2-${PCRE_VERSION}.tar.gz" | tar xz
+          curl -sSL "https://github.com/madler/zlib/archive/v${ZLIB_VERSION}.tar.gz" | tar xz
+
+      - name: Compile nginx
+        run: |
+          source "$GITHUB_WORKSPACE/conf/nginx-configure-flags"
+          cd /tmp/nginx-${NGINX_VERSION}
+          ./configure \
+            --prefix=/tmp/nginx-build \
+            --with-pcre=../pcre2-${PCRE_VERSION} \
+            --with-zlib=../zlib-${ZLIB_VERSION} \
+            "${NGINX_CONFIGURE_FLAGS[@]}"
+          sed -i "/CFLAGS/s/ \-O //g" objs/Makefile
+          make -j"$(nproc)"
+
+      - name: Verify nginx binary
+        run: |
+          /tmp/nginx-build/nginx -V