upd(ffmpeg): use cached ffmpeg build if unable to connect

Author: matthewjmarangoni

images/chromium-headful/Dockerfile

@@ -116,7 +116,16 @@ RUN --mount=type=cache,target=/tmp/cache/ffmpeg,id=ffmpeg \
     set -eux; \
     URL="https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz"; \
     echo "Downloading FFmpeg MD5 checksum"; \
-    curl -fsSL "${URL}.md5" -o /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; \
+    if ! curl --connect-timeout 10 -fsSL "${URL}.md5" -o /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; then \
+        echo "Failed to connect to ffmpeg static build provider for MD5 checksum."; \
+        echo "Checking for cached version to use."; \
+	if [ ! -f /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5 ]; then \
+	    echo "Unable to locate cached MD5 checksum. Exiting."; \
+	    exit 1; \
+	else \
+	    echo "Found cached MD5 checksum."; \
+	fi; \
+    fi; \
     sed -i -e 's/ .*$/ \/tmp\/cache\/ffmpeg\/ffmpeg.tar.xz/' /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; \
     echo "Checking cache for FFmpeg archive and validating MD5 checksum"; \
     if md5sum --check /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; then \

images/chromium-headless/image/Dockerfile

@@ -71,7 +71,16 @@ RUN --mount=type=cache,target=/tmp/cache/ffmpeg,id=ffmpeg \
     set -eux; \
     URL="https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz"; \
     echo "Downloading FFmpeg MD5 checksum"; \
-    curl -fsSL "${URL}.md5" -o /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; \
+    if ! curl --connect-timeout 10 -fsSL "${URL}.md5" -o /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; then \
+        echo "Failed to connect to ffmpeg static build provider for MD5 checksum."; \
+        echo "Checking for cached version to use."; \
+	if [ ! -f /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5 ]; then \
+	    echo "Unable to locate cached MD5 checksum. Exiting."; \
+	    exit 1; \
+	else \
+	    echo "Found cached MD5 checksum."; \
+	fi; \
+    fi; \
     sed -i -e 's/ .*$/ \/tmp\/cache\/ffmpeg\/ffmpeg.tar.xz/' /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; \
     echo "Checking cache for FFmpeg archive and validating MD5 checksum"; \
     if md5sum --check /tmp/cache/ffmpeg/ffmpeg.tar.xz.md5; then \