chore: always pass era-tester CI (vyperlang#3415)

This PR relaxes the check for era-tester CI
so that it always succeeds as a non-blocking
CI.

---------

Co-authored-by: Charles Cooper <cooper.charles.m@gmail.com>

.github/workflows/era-tester.yml

@@ -98,14 +98,20 @@ jobs:
 
     - name: Run tester (fast)
       # Run era tester with no LLVM optimizations
+      continue-on-error: true
       if: ${{ github.ref != 'refs/heads/master' }}
       run: |
         cd era-compiler-tester
         cargo run --release --bin compiler-tester -- --path=tests/vyper/ --mode="M0B0 ${{ env.VYPER_VERSION }}"
 
     - name: Run tester (slow)
       # Run era tester across the LLVM optimization matrix
+      continue-on-error: true
       if: ${{ github.ref == 'refs/heads/master' }}
       run: |
         cd era-compiler-tester
         cargo run --release --bin compiler-tester -- --path=tests/vyper/ --mode="M*B* ${{ env.VYPER_VERSION }}"
+
+    - name: Mark as success
+      run: |
+        exit 0