Fix github actions env names

Author: mczachurski

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
         swift-version: '5.2'
     - shell: bash
       env:
-        MAILTRAPPASS: ${{ secrets.MAILTRAPUSER }}
+        MAILTRAPUSER: ${{ secrets.MAILTRAPUSER }}
       run: |
         sed -i -e 's/#MAILTRAPUSER#/'"$MAILTRAPUSER"'/g' Tests/SmtpTests/SmtpTests.swift
     - shell: bash
@@ -24,7 +24,7 @@ jobs:
         sed -i -e 's/#MAILTRAPPASS#/'"$MAILTRAPPASS"'/g' Tests/SmtpTests/SmtpTests.swift
     - shell: bash
       env:
-        GMAILPASS: ${{ secrets.GMAILUSER }}
+        GMAILUSER: ${{ secrets.GMAILUSER }}
       run: |
         sed -i -e 's/#GMAILUSER#/'"$GMAILUSER"'/g' Tests/SmtpTests/SmtpTests.swift
     - shell: bash