Properly evaluate the context of a jobs.<job_id>.steps.if step

Reference: https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#example-using-contexts

.github/workflows/unit-tests.yml

@@ -20,7 +20,7 @@ jobs:
 
     - name: Configure PHP environment
       uses: shivammathur/setup-php@v2
-      if: ${{ matrix.php }} >= 7.2
+      if: ${{ matrix.php >= '7.2' }}
       with:
         php-version: ${{ matrix.php }}
         tools: pecl
@@ -30,7 +30,7 @@ jobs:
 
     - name: Configure PHP environment (PHP 7.1 only)
       uses: shivammathur/setup-php@v2
-      if: ${{ matrix.php }} == 7.1
+      if: ${{ matrix.php == '7.1' }}
       with:
         php-version: ${{ matrix.php }}
         tools: pecl
@@ -40,7 +40,7 @@ jobs:
 
     - name: Configure PHP environment (PHP 7.0 only)
       uses: shivammathur/setup-php@v2
-      if: ${{ matrix.php }} == 7.0
+      if: ${{ matrix.php == '7.0' }}
       with:
         php-version: ${{ matrix.php }}
         tools: pecl
@@ -50,7 +50,7 @@ jobs:
 
     - name: Configure PHP environment (PHP 5.x only)
       uses: shivammathur/setup-php@v2
-      if: ${{ matrix.php }} <= 5.6
+      if: ${{ matrix.php <= '5.6' }}
       with:
         php-version: ${{ matrix.php }}
         tools: pecl