Add .NET buildpack #1273

Job	Run time
create (builder-20, amd64)	59s
create (builder-22, amd64)	1m 1s
create (builder-24, amd64)	1m 0s
create (builder-24, arm64)	44s
create (salesforce-functions, amd64)	43s
test-functions (java)	48s
test (dotnet, builder-24, amd64)	1m 1s
test-functions (javascript)	47s
test (dotnet, builder-24, arm64)	1m 19s
test-functions (typescript)	51s
test (go, builder-20, amd64)	1m 0s
test (go, builder-22, amd64)	50s
test (go, builder-24, amd64)	56s
test (go, builder-24, arm64)	51s
test (gradle, builder-20, amd64)	1m 38s
test (gradle, builder-22, amd64)	1m 43s
test (gradle, builder-24, amd64)	1m 33s
test (gradle, builder-24, arm64)	1m 52s
test (java, builder-20, amd64)	1m 7s
test (java, builder-22, amd64)	52s
test (java, builder-24, amd64)	58s
test (java, builder-24, arm64)	56s
test (node-js, builder-20, amd64)	48s
test (node-js, builder-22, amd64)	41s
test (node-js, builder-24, amd64)	38s
test (node-js, builder-24, arm64)	41s
test (php, builder-20, amd64)	53s
test (php, builder-22, amd64)	40s
test (php, builder-24, amd64)	34s
test (php, builder-24, arm64)	29s
test (python, builder-20, amd64)	55s
test (python, builder-22, amd64)	49s
test (python, builder-24, amd64)	39s
test (python, builder-24, arm64)	40s
test (ruby, builder-20, amd64)	2m 14s
test (ruby, builder-22, amd64)	2m 10s
test (ruby, builder-24, amd64)	2m 17s
test (ruby, builder-24, arm64)	2m 24s
test (scala, builder-20, amd64)	1m 31s
test (scala, builder-22, amd64)	1m 24s
test (scala, builder-24, amd64)	1m 25s
test (scala, builder-24, arm64)	1m 26s
publish-image	0s
publish-manifest	0s
	46m 47s

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