patch(integration_test_charm.yaml): Free up disk space (#104)

Reduce issues with running out of disk space (causing the runner to
crash)

.github/workflows/integration_test_charm.yaml

@@ -132,6 +132,15 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 120
     steps:
+      - name: Free up disk space
+        run: |
+          printf '\nDisk usage before cleanup\n'
+          df --human-readable
+          # Based on https://github.com/actions/runner-images/issues/2840#issuecomment-790492173
+          rm -r /usr/share/dotnet
+          rm -r /opt/hostedtoolcache/
+          printf '\nDisk usage after cleanup\n'
+          df --human-readable
       - name: Install CLI
         run: pipx install git+https://github.com/canonical/data-platform-workflows@'${{ needs.get-workflow-version.outputs.version }}'#subdirectory=python/cli
       - name: Redact secrets from log
@@ -271,3 +280,5 @@ jobs:
           name: intergration-test-charm-logs-${{ inputs.cloud }}-juju-${{ inputs.juju-agent-version || inputs.juju-snap-channel }}
           path: ~/logs/
           if-no-files-found: error
+      - name: Disk usage
+        run: df --human-readable

.github/workflows/integration_test_charm_self_hosted.yaml

@@ -125,6 +125,8 @@ jobs:
     runs-on: [self-hosted, linux, X64, jammy, large]
     timeout-minutes: 120
     steps:
+      - name: Disk usage
+        run: df --human-readable
       - name: Install CLI
         run: |
           sudo apt-get install python3-pip python3-venv -y
@@ -234,3 +236,5 @@ jobs:
           name: intergration-test-charm-logs-${{ inputs.cloud }}-juju-${{ inputs.juju-agent-version || inputs.juju-snap-channel }}
           path: ~/logs/
           if-no-files-found: error
+      - name: Disk usage
+        run: df --human-readable