Add missing 'set -xe' to RUN commands

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Images built:

dotnet-core: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-core@sha256:0f3693ed04dd9356d65783cd0fc2c027840ca0a4f69207d3792f9c8a7d64e004
dotnet-framework: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-framework@sha256:3f128c796fb08ae43135ab556786b60590b8cd035a1b621252359b8f160d0999
java: ghcr.io/contrast-security-oss/agent-operator-images/agent-java@sha256:a557d40c0d560cb8d318b96e6c5930c3e665dc1bb86741f40092ab856dc1f297
nodejs: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs@sha256:fc0a2ae468d874a663e0df85f5bba259be56c8d1502a64b6e0b0af8d0bc85e74
php: ghcr.io/contrast-security-oss/agent-operator-images/agent-php@sha256:5d164aa0f572b85bf28af590817e7d984a02bba26db7e7808f0ee367d019060b
python: ghcr.io/contrast-security-oss/agent-operator-images/agent-python@sha256:50e55625b05984d7cc2b17bf4e3480ee1a754cd7798cbcf1d9978fababf6564a
flex: ghcr.io/contrast-security-oss/agent-operator-images/agent-flex@sha256:be136da44e21fdcb2625b7cf20b9cced1eb302f3b1beb1d43a8ca8970e3b5a3b