Drop build caches

Author: angelsl

.github/workflows/ci.yml

@@ -51,9 +51,9 @@ jobs:
           path: |
             _build
             priv/plts
-          key: ${{ runner.os }}-erlang-${{ env.OTP_VERSION }}-elixir-${{ env.ELIXIR_VERSION }}-${{ github.sha }}
+          key: 1-${{ runner.os }}-erlang-${{ env.OTP_VERSION }}-elixir-${{ env.ELIXIR_VERSION }}-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-erlang-${{ env.OTP_VERSION }}-elixir-${{ env.ELIXIR_VERSION }}-
+            1-${{ runner.os }}-erlang-${{ env.OTP_VERSION }}-elixir-${{ env.ELIXIR_VERSION }}-
       - name: Setup Elixir
         uses: erlef/setup-elixir@v1
         with: