build: fix docker beta build running out of space

This removes some unused SDKs from the build machine to free some
space up before building. It also adds some lines to show the free
space.

.github/workflows/build_publish_beta_docker_image.yml

@@ -10,6 +10,15 @@ jobs:
         runs-on: ubuntu-latest
         name: Build image job
         steps:
+            - name: Free some space
+              shell: bash
+              run: |
+                df -h .
+                # Remove android SDK
+                sudo rm -rf /usr/local/lib/android || true
+                # Remove .net runtime
+                sudo rm -rf /usr/share/dotnet || true
+                df -h .
             - name: Checkout master
               uses: actions/checkout@v4
               with:
@@ -42,7 +51,10 @@ jobs:
                 # See https://docs.github.com/en/actions/security-guides/automatic-token-authentication#about-the-github_token-secret
                 # for more detailed information.
                 password: ${{ secrets.GITHUB_TOKEN }}
-
+            - name: Show disk usage
+              shell: bash
+              run: |
+                df -h .
             - name: Build and publish image
               uses: docker/build-push-action@v5
               with:
@@ -54,8 +66,12 @@ jobs:
                   rclone/rclone:beta
                 labels: ${{ steps.meta.outputs.labels }}
                 platforms: linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/arm/v6
-                cache-from: type=gha
+                cache-from: type=gha, scope=${{ github.workflow }}
-                cache-to: type=gha,mode=max
+                cache-to: type=gha, mode=max, scope=${{ github.workflow }}
                 provenance: false
               # Eventually cache will need to be cleared if builds more frequent than once a week
               # https://github.com/docker/build-push-action/issues/252
+            - name: Show disk usage
+              shell: bash
+              run: |
+                df -h .