try fixing workflow

Author: marc-aurele-besner

.github/workflows/deploy.yml

@@ -3,6 +3,7 @@ name: Elixir CI/CD
 on:
   push:
     branches: [ main ]
+  workflow_dispatch:
 
 jobs:
   test:
@@ -24,6 +25,9 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: erlef/setup-beam@v1
+        with:
+          otp-version: '23.3'
+          elixir-version: '1.9.4'
       - name: Cache dependencies
         uses: actions/cache@v2
         with:

.github/workflows/test-build.yml

@@ -3,6 +3,7 @@ name: Test Build Process
 on:
   pull_request:
     branches: [ main ]
+  workflow_dispatch:
 
 jobs:
   test:
@@ -24,6 +25,9 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: erlef/setup-beam@v1
+        with:
+          otp-version: '23.3'
+          elixir-version: '1.9.4'
       - name: Cache dependencies
         uses: actions/cache@v2
         with: