Re-enable x86 tests

.github/workflows/dendrite.yml

@@ -81,6 +81,11 @@ jobs:
     timeout-minutes: 10
     name: Unit tests
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        goos: [ "linux" ]
+        goarch: [ "amd64", "386" ]
     # Service containers to run with `container-job`
     services:
       # Label used to access the service container
@@ -110,14 +115,16 @@ jobs:
         with:
           go-version: "stable"
       - uses: actions/cache@v3
-        # manually set up caches, as they otherwise clash with different steps using setup-go with cache=true
         with:
           path: |
             ~/.cache/go-build
             ~/go/pkg/mod
-          key: ${{ runner.os }}-go-stable-unit-${{ hashFiles('**/go.sum') }}
+          key: ${{ runner.os }}-go-stable-unit-${{ matrix.goos }}-${{ matrix.goarch }}-${{ hashFiles('**/go.sum') }}
           restore-keys: |
-            ${{ runner.os }}-go-stable-unit-
+            key: ${{ runner.os }}-go-stable-unit-${{ matrix.goos }}-${{ matrix.goarch }}-
+      - name: Install dependencies x86
+        if: ${{ matrix.goarch == '386' }}
+        run: sudo apt update && sudo apt-get install -y gcc-multilib
       - name: Set up gotestfmt
         uses: gotesttools/gotestfmt-action@v2
         with:
@@ -125,6 +132,8 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
       - run: go test -json -v ./... 2>&1 | gotestfmt -hide all
         env:
+          GOOS: ${{ matrix.goos }}
+          GOARCH: ${{ matrix.goarch }}
           POSTGRES_HOST: localhost
           POSTGRES_USER: postgres
           POSTGRES_PASSWORD: postgres