Fix `lucee5-light-alpine` to use correct Dockerfile #38

Job	Run time
pr-tests (builds/debian/Base.Dockerfile, latest)	6m 36s
pr-tests (builds/debian/Base.Dockerfile, jre11)	7m 9s
pr-tests (builds/base/JDK11.Dockerfile, jdk11)	7m 14s
pr-tests (builds/debian/Base.JDK8.Dockerfile, jdk8)	6m 33s
pr-tests (builds/debian/Lucee5.Dockerfile, lucee5)	8m 24s
pr-tests (builds/debian/LuceeLight.Dockerfile, lucee-light)	8m 6s
pr-tests (builds/debian/Adobe2018.Dockerfile, adobe2018)	9m 10s
pr-tests (builds/debian/Adobe2021.Dockerfile, adobe2021)	8m 46s
pr-tests (builds/ubi9/Base.Dockerfile, ubi9)	6m 35s
pr-tests (builds/ubi9/Base.Dockerfile, jre11-ubi9)	6m 41s
pr-tests (builds/base/ubi9.JDK11.Dockerfile, jdk11-ubi9)	6m 38s
pr-tests (builds/ubi9/Lucee5.Dockerfile, lucee5-ubi9)	8m 14s
pr-tests (builds/ubi9/LuceeLight.Dockerfile, lucee-light-ubi9)	7m 48s
pr-tests (builds/ubi9/Adobe2018.Dockerfile, adobe2018-ubi9)	9m 28s
pr-tests (builds/ubi9/Adobe2021.Dockerfile, adobe2021-ubi9)	8m 55s
pr-tests (builds/alpine/Base.Dockerfile, alpine)	6m 39s
pr-tests (builds/alpine/Base.Dockerfile, jre11-alpine)	6m 36s
pr-tests (builds/base/Alpine.JDK11.Dockerfile, jdk11-alpine)	6m 42s
pr-tests (builds/alpine/Base.JDK8.Dockerfile, jdk8-alpine)	6m 25s
pr-tests (builds/alpine/Lucee5.Dockerfile, lucee5-alpine)	8m 25s
pr-tests (builds/alpine/LuceeLight.Dockerfile, lucee-light-alpine)	8m 0s
pr-tests (builds/alpine/Adobe2018.Dockerfile, adobe2018-alpine)	9m 26s
pr-tests (builds/alpine/Adobe2021.Dockerfile, adobe2021-alpine)	9m 15s
	2h 57m 45s

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