Remove archlinux from the php7 CI

Arch doesn't ship php7 anymore

.github/workflows/distributions_php7.yml

@@ -68,29 +68,3 @@ jobs:
         if: ${{ failure() }}
         run: |
           grep -r . --include='*.log' src/tests
-
-  archlinux:
-    runs-on: ubuntu-latest
-    container: archlinux:latest
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v3
-      - name: Remove php8 tests for php7
-        run: rm -rf src/tests/*php8*/ src/tests/*/*_php8.phpt
-      - name: Install dependencies
-        continue-on-error: true
-        run: |
-          pacman --sync --refresh --noconfirm --quiet php wget autoconf gcc make re2c
-          wget https://pear.php.net/go-pear.phar
-          php go-pear.phar
-      - name: Install pecl
-        continue-on-error: true
-        run: pecl install vld-beta
-      - name: Build SP and run the testsuite
-        continue-on-error: true
-        run: make tests
-      - name: Show logs in case of failure
-        continue-on-error: true
-        if: ${{ failure() }}
-        run: |
-          grep -r . --include='*.log' src/tests