ci: add test and build workflow

.github/workflows/ci.yml

@@ -0,0 +1,72 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: dtolnay/rust-toolchain@6bed0761d98439e5a578e2877258200ad565ba87 # stable
+        with:
+          toolchain: stable
+          components: clippy, rustfmt
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+      - run: cargo fmt --check
+      - run: cargo clippy --all-targets --release -- -D warnings
+      - run: cargo test --release
+      - run: shellcheck bin/gh-img scripts/*.sh deploy/install.sh
+      - run: sudo apt-get update -q && sudo apt-get install -y -q libimage-exiftool-perl
+      - uses: astral-sh/setup-uv@c18668ad3cf93ea998bef934396af7bb5c839dc7 # v10.2.0
+        with:
+          # no lockfile to key the cache on
+          enable-cache: false
+      - run: scripts/check-fixtures.sh
+
+  build:
+    runs-on: ubuntu-latest
+    env:
+      TARGET: x86_64-unknown-linux-musl
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - uses: dtolnay/rust-toolchain@6bed0761d98439e5a578e2877258200ad565ba87 # stable
+        with:
+          toolchain: stable
+          targets: x86_64-unknown-linux-musl
+      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+      - uses: mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29 # v2.2.1
+        with:
+          version: 0.16.0
+      - uses: taiki-e/install-action@4cef1412cce204788f482e778a0b9187f9626a29 # v2.87.21
+        with:
+          tool: cargo-zigbuild@0.23.4
+      - run: cargo zigbuild --release --target "$TARGET"
+      - name: Check the binary is static
+        run: |
+          info=$(file "target/$TARGET/release/gh-img-server")
+          echo "$info"
+          grep -Eq 'statically linked|static-pie linked' <<<"$info"
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: gh-img-server-${{ env.TARGET }}
+          path: target/${{ env.TARGET }}/release/gh-img-server
+          retention-days: 7
+          if-no-files-found: error