Install Subway by extracting binary from acala/subway:v0.1.1 Docker image

The `v0.1.1` GitHub Release at AcalaNetwork/subway is missing its
`x86_64-unknown-linux-musl.tar.gz` asset; the release workflow's
`Build release binary` step failed (`cargo build --locked` mismatched
the bumped `Cargo.toml` version), so the upload was skipped. The
upstream tag still produces a working Docker image because
`docker.yml` doesn't use `--locked`, so `acala/subway:v0.1.1` is
the only working consumption path for v0.1.1.

The image's binary lives at `/usr/local/bin/subway` (per Subway's
Dockerfile); copying it out with `docker create` + `docker cp` lands
in roughly the same wall time as the curl-and-untar path and unblocks
consumption of PR #203's `request_timeout_seconds` config field.

Author: rockbmb

.github/workflows/ci.yml

@@ -57,8 +57,9 @@ jobs:
 
       - name: Install Subway
         run: |
-          curl -fsSL https://github.com/AcalaNetwork/subway/releases/download/v0.1.0/subway-v0.1.0-x86_64-unknown-linux-musl.tar.gz \
-            | sudo tar -xz -C /usr/local/bin
+          docker create --name subway-extract acala/subway:v0.1.1
+          sudo docker cp subway-extract:/usr/local/bin/subway /usr/local/bin/subway
+          docker rm subway-extract
           sudo chmod +x /usr/local/bin/subway
           subway --version
 

.github/workflows/update-known-good.yml

@@ -93,8 +93,9 @@ jobs:
       # rate-limiting from production endpoints during test runs
       - name: Install Subway
         run: |
-          curl -fsSL https://github.com/AcalaNetwork/subway/releases/download/v0.1.0/subway-v0.1.0-x86_64-unknown-linux-musl.tar.gz \
-            | sudo tar -xz -C /usr/local/bin
+          docker create --name subway-extract acala/subway:v0.1.1
+          sudo docker cp subway-extract:/usr/local/bin/subway /usr/local/bin/subway
+          docker rm subway-extract
           sudo chmod +x /usr/local/bin/subway
           subway --version
 

.github/workflows/update-snapshot.yml

@@ -43,8 +43,9 @@ jobs:
 
     - name: Install Subway
       run: |
-        curl -fsSL https://github.com/AcalaNetwork/subway/releases/download/v0.1.0/subway-v0.1.0-x86_64-unknown-linux-musl.tar.gz \
-          | sudo tar -xz -C /usr/local/bin
+        docker create --name subway-extract acala/subway:v0.1.1
+        sudo docker cp subway-extract:/usr/local/bin/subway /usr/local/bin/subway
+        docker rm subway-extract
         sudo chmod +x /usr/local/bin/subway
         subway --version