ci: fix typo

.github/workflows/run_api_tests.yaml

@@ -40,7 +40,7 @@ jobs:
       uses: actions/cache@v2
       with:
         path: source/_build/default/lib/quicer/
-        key: ${{ matrix.os }}-${{ matrix.otp }}-$${{ matrix.arch }}-${{ steps.deps-refs.outputs.DEP_QUICER_REF }}
+        key: ${{ matrix.os }}-${{ matrix.otp }}-${{ matrix.arch }}-${{ steps.deps-refs.outputs.DEP_QUICER_REF }}
 
     - name: build EMQ X CE and EE tgz package
       if: endsWith(github.repository, 'emqx')

.github/workflows/run_emqx_app_tests.yaml

@@ -38,7 +38,7 @@ jobs:
       uses: actions/cache@v2
       with:
         path: _build/default/lib/quicer/
-        key: ${{ matrix.os }}-${{ matrix.otp }}-$${{ matrix.arch }}-${{ steps.deps-refs.outputs.DEP_QUICER_REF }}
+        key: ${{ matrix.os }}-${{ matrix.otp }}-${{ matrix.arch }}-${{ steps.deps-refs.outputs.DEP_QUICER_REF }}
     - name: run
       run: |
         make ensure-rebar3

.github/workflows/run_test_cases.yaml

@@ -42,7 +42,7 @@ jobs:
           uses: actions/cache@v2
           with:
             path: source/_build/default/lib/quicer/
-            key: ${{ matrix.os }}-${{ matrix.otp }}-$${{ matrix.arch }}-${{ steps.deps-refs.outputs.DEP_QUICER_REF }}
+            key: ${{ matrix.os }}-${{ matrix.otp }}-${{ matrix.arch }}-${{ steps.deps-refs.outputs.DEP_QUICER_REF }}
 
         - name: proper
           run: make proper