fix(dockerfile): add retry logic for install-php-extensions download in v1

Adds 3-attempt retry loop with 5s/10s/20s exponential backoff for:
1. install-php-extensions script download from GitHub
2. PHP extension compilation and installation

This addresses transient network timeouts that occur on both Alpine and
Debian builds. The retry logic handles:
- Network timeouts during curl download
- Compilation/installation failures due to transient issues
- Clear logging of retry attempts and failures

Each layer has independent retry loops for robustness.

Author: KingPin

Dockerfile.v1

@@ -24,12 +24,39 @@ RUN if [ "$BASEOS" = "bullseye" ]; then \
         apk add --no-cache curl git zip unzip ghostscript imagemagick optipng gifsicle pngcrush jpegoptim libjpeg-turbo libjpeg-turbo-utils pngquant libwebp-tools; \
     fi
 
-# Add all needed PHP extensions
-RUN curl -sSLf -o /usr/local/bin/install-php-extensions \
-        https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions && \
-        chmod +x /usr/local/bin/install-php-extensions && \
-        install-php-extensions amqp bcmath bz2 calendar ctype exif intl imagick imap json mbstring ldap mcrypt memcached mongodb \
-         mysqli opcache pdo_mysql pdo_pgsql pgsql redis snmp soap sockets tidy timezonedb uuid vips xsl yaml zip zstd @composer
+# Add all needed PHP extensions with retry logic for transient network failures
+RUN for ATTEMPT in 1 2 3; do \
+        if curl -sSLf -o /usr/local/bin/install-php-extensions \
+            https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions; then \
+            break; \
+        else \
+            if [ $ATTEMPT -lt 3 ]; then \
+                SLEEP_TIME=$((5 * 2 ** (ATTEMPT - 1))); \
+                echo "Download attempt $ATTEMPT failed, retrying in ${SLEEP_TIME}s..."; \
+                sleep $SLEEP_TIME; \
+                rm -f /usr/local/bin/install-php-extensions; \
+            else \
+                echo "Failed to download install-php-extensions after 3 attempts"; \
+                exit 1; \
+            fi; \
+        fi; \
+    done && \
+    chmod +x /usr/local/bin/install-php-extensions && \
+    for ATTEMPT in 1 2 3; do \
+        if install-php-extensions amqp bcmath bz2 calendar ctype exif intl imagick imap json mbstring ldap mcrypt memcached mongodb \
+           mysqli opcache pdo_mysql pdo_pgsql pgsql redis snmp soap sockets tidy timezonedb uuid vips xsl yaml zip zstd @composer; then \
+            break; \
+        else \
+            if [ $ATTEMPT -lt 3 ]; then \
+                SLEEP_TIME=$((5 * 2 ** (ATTEMPT - 1))); \
+                echo "Extension installation attempt $ATTEMPT failed, retrying in ${SLEEP_TIME}s..."; \
+                sleep $SLEEP_TIME; \
+            else \
+                echo "Failed to install PHP extensions after 3 attempts"; \
+                exit 1; \
+            fi; \
+        fi; \
+    done
 
 # Enable Apache rewrite mod, if applicable
 RUN if command -v a2enmod; then a2enmod rewrite; fi