ci: reclaim some space in runner vm

.github/workflows/scripts/setup.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -eu
+
+df -h
+
+sudo systemd-run --wait rm -rf \
+     /usr/share/az* \
+     /usr/share/dotnet \
+     /usr/share/gradle* \
+     /usr/share/miniconda \
+     /usr/share/swift \
+     /var/lib/gems \
+     /var/lib/mysql \
+     /var/lib/snapd
+
+sudo fstrim /
+
+df -h

.github/workflows/ubuntu.yml

@@ -54,6 +54,9 @@ jobs:
           ]
 
     steps:
+    - name: Setup
+      run: .github/workflows/scripts/setup.sh
+
     - uses: actions/checkout@v1
 
     - name: Build
@@ -108,6 +111,9 @@ jobs:
           ]
 
     steps:
+    - name: Setup
+      run: .github/workflows/scripts/setup.sh
+
     - uses: actions/checkout@v1
 
     - name: Build