Add ffmpeg package to n8n Docker image for media processing (#118) #632

Job	Run time
lint	24s
Dockerfile Linting	8s
Service Availability Check	2m 30s
SonarQube	-1s
Docker Security Scanning (n8n, Dockerfile.n8n, n8n-test:latest)	4m 27s
Docker Security Scanning (temporal, Dockerfile.temporal, temporal-test:latest)	56s
	8m 24s

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