Added autopkgtests for openslide

[Mohd Bilal]

Hello team,




[1] - https://salsa.debian.org/med-team/openslide

Regards,
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│ Mohammed Bilal                                     │
│ 2D65 BC1E B966 5A6E 97F9  730A B3F5 9452 8521 9E1F │
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I've added autopkgtests for openslide[1]. Requesting someone to review and sponsor my changes.

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