Feat/dockerfile (#47)

* feat: Add dockerfile to run librespeed-cli in a container.

* docs: Instructions to build and run container.

Author: dbrennand

README.md

@@ -97,6 +97,26 @@ $ makepkg -si
 
 See the [librespeed-cli Homebrew tap](https://github.com/librespeed/homebrew-tap#setup).
 
+## Container Image
+
+You can run `librespeed-cli` in a container.
+
+1. Build the container image:
+
+    ```shell script
+    docker build -t librespeed-cli:latest .
+    ```
+
+2. Run the container:
+
+    ```shell script
+    docker run --rm --name librespeed-cli librespeed-cli:latest
+    # With options
+    docker run --rm --name librespeed-cli librespeed-cli:latest --telemetry-level disabled --no-upload
+    # To avoid "Failed to ping target host: socket: permission denied" errors when using --verbose
+    docker run --rm --name librespeed-cli --sysctl net.ipv4.ping_group_range="0 2147483647" librespeed-cli:latest --verbose
+    ```
+
 ## Usage
 
 You can see the full list of supported options with `librespeed-cli -h`:

dockerfile

@@ -0,0 +1,17 @@
+FROM golang:1.17.7-buster as builder
+
+# Set working directory
+WORKDIR /usr/src/librespeed-cli
+
+# Copy librespeed-cli
+COPY . .
+
+# Build librespeed-cli
+RUN ./build.sh
+
+FROM golang:1.17.7-buster
+
+# Copy librespeed-cli binary
+COPY --from=builder /usr/src/librespeed-cli/out/librespeed-cli* /usr/src/librespeed-cli/librespeed-cli
+
+ENTRYPOINT ["/usr/src/librespeed-cli/librespeed-cli"]