standardize apt-get

root/etc/cont-init.d/94-php8-src

@@ -0,0 +1,10 @@
+#!/usr/bin/with-contenv bash
+
+ppa="ppa:ondrej/php"
+if ! grep -q "^deb .*${ppa}" /etc/apt/sources.list /etc/apt/sources.list.d/*; then
+    echo "**** adding ppa ondrej/php ****"
+    if ! dpkg -l | grep software-properties-common > /dev/null; then
+        apt-get update && apt-get install -y software-properties-common
+    fi
+    add-apt-repository ${ppa} -y
+fi

root/etc/cont-init.d/95-apt-get

@@ -0,0 +1,3 @@
+#!/usr/bin/with-contenv bash
+
+apt-get update

root/etc/cont-init.d/98-php8

@@ -1,14 +1,6 @@
 #!/usr/bin/with-contenv bash
 
-echo "**** adding ppa ondrej/php ****"
-apt-get update && apt-get install -y \
-  software-properties-common
-ppa="ppa:ondrej/php"
-if ! grep -q "^deb .*${ppa}" /etc/apt/sources.list /etc/apt/sources.list.d/*; then
-    add-apt-repository ${ppa} -y
-fi
-
-echo "**** installing php and composer ****"
-apt-get update && apt-get install -y \
+echo "**** installing php8 and composer ****"
+apt-get install -y \
   composer \
   php8.0