Move private repository tests + implement env helper function

Signed-off-by: Guillaume de Rouville <guillaume.derouville@gmail.com>

tests/ops/fetch-git/private-repo/.dagger/env/op-fetch-git/.gitignore

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+# dagger state
+state/**

tests/ops/fetch-git/private-repo/.dagger/env/op-fetch-git/values.yaml

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+plan:
+    package: .
+name: op-fetch-git
+inputs:
+    TestPAT:
+        secret: ENC[AES256_GCM,data:TVMwgMe+Q/BzQ/rxKIr9lRPuu2FpVQXppufy33lWQ8An+c9cTSVLCQ==,iv:Xpe54Llfcu1aTWkzNxUtcRrrqIlI/i4pdshOCVKeREY=,tag:Ugwzcpmddzhq62gPKpAkkQ==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age1gxwmtwahzwdmrskhf90ppwlnze30lgpm056kuesrxzeuyclrwvpsupwtpk
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBoamxhWnpyQzJRcE9TRldj
+            Rmd6eHV5TnpReENzNHI3MFZRZWpqaGJoRzFjClMyQW1raVNiSU84blhhSzRja01F
+            cjVpVmxJS1o0NEdlTXYvQ290Rjdma0kKLS0tIDkrTjRHTEtaaDY2QzhBaVJYRjhn
+            OXA2TkFjYlVNMFFEblA2MUZRWVB3T3MKhunM53KD+jGvdAInPbr+N6YrpirLIp4V
+            seb6c4bryHPL+zZWSX1H04sCWgGOypLfYq/fUyPOunbs/b+AWn8chw==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2021-08-26T09:34:51Z"
+    mac: ENC[AES256_GCM,data:JUo5COutVZMqJN2UNhqL842hhGsMdCLOFFo5g4HDFMQLG3M1iQ2M0i8AjnAlPGMukNoF3qr/rTf6FCNdpeXc/oXiOM+q0w9xp+jGup5uplhXUWw+au4YHXbSezxCVtmKCRIzkDBiN5x2zKLg7qBzsqKdzyeBiBI/QAPCoXuTk4g=,iv:m4GKvZ8g4dniAbTnUO+wjZlYx6uCJcCwkanoAzjciuY=,tag:vUUHFcGg5OIjDHeI0B+RGw==,type:str]
+    pgp: []
+    encrypted_suffix: secret
+    version: 3.7.1

tests/ops/fetch-git/private-repo/cue.mod/module.cue

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+module: ""

tests/ops/fetch-git/private-repo/cue.mod/pkg/.gitignore

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+# dagger universe
+alpha.dagger.io

tests/ops/fetch-git/private-repo/fetch-git.cue

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+package op
+
+import (
+	"alpha.dagger.io/os"
+	"alpha.dagger.io/dagger"
+	"alpha.dagger.io/dagger/op"
+)
+
+// Github PAT
+TestPAT: dagger.#Input & {dagger.#Secret}
+
+TestRepo: #up: [op.#FetchGit & {
+	remote:          "https://github.com/dagger/dagger.git"
+	ref:             "main"
+	authTokenSecret: TestPAT
+}]
+
+TestContent: os.#Container & {
+	always:  true
+	command: "ls -l /input/repo | grep 'universe -> stdlib'"
+	mount: "/input/repo": from: TestRepo
+}