feat: update Docker build for armv7 and refactor architecture detection (#103)

.github/workflows/probe-build.yml

@@ -169,7 +169,7 @@ jobs:
 
   docker:
     needs: validate
-    name: Docker image amd64/arm64
+    name: Docker image amd64/arm64/armv7
     runs-on: ubuntu-latest
     permissions:
       contents: read
@@ -242,7 +242,7 @@ jobs:
         with:
           context: .
           file: ./probe/Dockerfile
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

probe/src/update.rs

@@ -227,11 +227,7 @@ fn detect_platform() -> Result<(PackageKind, String, bool)> {
             .any(|line| line.split_whitespace().next() == Some("luci-app-cheburprobe"));
         Ok((PackageKind::Opkg, architecture.to_owned(), luci_installed))
     } else {
-        let architecture = match env::consts::ARCH {
-            "x86_64" => "amd64",
-            "aarch64" => "arm64",
-            architecture => bail!("unsupported standalone Linux architecture: {architecture}"),
-        };
+        let architecture = standalone_linux_architecture(env::consts::ARCH)?;
         Ok((PackageKind::Linux, architecture.to_owned(), false))
     }
 
@@ -239,6 +235,16 @@ fn detect_platform() -> Result<(PackageKind, String, bool)> {
     bail!("updates are not supported on this operating system")
 }
 
+#[cfg(target_os = "linux")]
+fn standalone_linux_architecture(architecture: &str) -> Result<&'static str> {
+    match architecture {
+        "x86_64" => Ok("amd64"),
+        "aarch64" => Ok("arm64"),
+        "arm" => Ok("armv7"),
+        architecture => bail!("unsupported standalone Linux architecture: {architecture}"),
+    }
+}
+
 #[cfg(target_os = "linux")]
 fn openwrt_apk_arch() -> Result<String> {
     if let Ok(architecture) = std::fs::read_to_string("/etc/apk/arch") {