chore(ci): Enable S3 caching for interop (#1193)

- Adds our S3 bucket for caching docker images as Protocol Labs shut
down their shared one.
- Remove the free disk space workaround that prevented the jobs from
failing for using too much space for the images.

---------

Co-authored-by: diegomrsantos <diego@status.im>

.github/workflows/interop.yml

@@ -17,12 +17,6 @@ jobs:
     name: Run transport interoperability tests
     runs-on: ubuntu-22.04
     steps:
-      - name: Free Disk Space (Ubuntu)
-        # For some reason the original job (libp2p/test-plans) has enough disk space, but this one doesn't.
-        uses: jlumbroso/free-disk-space@v1.3.1
-        with:
-          tool-cache: true
-
       - uses: actions/checkout@v4
       - uses: docker/setup-buildx-action@v3
       - name: Build image
@@ -32,6 +26,10 @@ jobs:
         with:
           test-filter: nim-libp2p-head
           extra-versions: ${{ github.workspace }}/tests/transport-interop/version.json
+          s3-cache-bucket: ${{ vars.S3_LIBP2P_BUILD_CACHE_BUCKET_NAME }}
+          s3-access-key-id: ${{ vars.S3_LIBP2P_BUILD_CACHE_AWS_ACCESS_KEY_ID }}
+          s3-secret-access-key: ${{ secrets.S3_LIBP2P_BUILD_CACHE_AWS_SECRET_ACCESS_KEY }}
+          aws-region: ${{ vars.S3_LIBP2P_BUILD_CACHE_AWS_REGION }}
 
   run-hole-punching-interop:
     name: Run hole-punching interoperability tests
@@ -46,3 +44,7 @@ jobs:
         with:
           test-filter: nim-libp2p-head
           extra-versions: ${{ github.workspace }}/tests/hole-punching-interop/version.json
+          s3-cache-bucket: ${{ vars.S3_LIBP2P_BUILD_CACHE_BUCKET_NAME }}
+          s3-access-key-id: ${{ vars.S3_LIBP2P_BUILD_CACHE_AWS_ACCESS_KEY_ID }}
+          s3-secret-access-key: ${{ secrets.S3_LIBP2P_BUILD_CACHE_AWS_SECRET_ACCESS_KEY }}
+          aws-region: ${{ vars.S3_LIBP2P_BUILD_CACHE_AWS_REGION }}