Temporary revert GPG feature for semver based retagging (#373)

Feature #343 happens to be a breaking change when enabling `.Values.signing` but not specifying
any of the new private key properties. Tag `v6.0.2` is therefore not following semantic versioning.

This temporarily reverts commit b8f0310c43 and a fix-up commit 57a1cd27d9
to retag 6.0.2 as 6.0.3.

Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/373
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: luhahn <luhahn@noreply.gitea.io>

unittests/init/init_directory_structure.sh.yaml

@@ -1,64 +0,0 @@
-suite: Init template
-release:
-  name: gitea-unittests
-  namespace: testing
-templates:
-  - templates/gitea/init.yaml
-tests:
-  - it: runs gpg in batch mode
-    set:
-      signing.enabled: true
-    asserts:
-      - equal:
-          path: stringData.[configure_gpg_environment.sh]
-          value: |-
-            #!/usr/bin/env bash
-            set -eu
-
-            gpg --batch --import /raw/private.asc
-  - it: skips gpg script block for disabled signing
-    asserts:
-      - equal:
-          path: stringData.[init_directory_structure.sh]
-          value: |-
-            #!/usr/bin/env bash
-
-            set -euo pipefail
-
-            set -x
-            chown 1000:1000 /data
-            mkdir -p /data/git/.ssh
-            chmod -R 700 /data/git/.ssh
-            [ ! -d /data/gitea/conf ] && mkdir -p /data/gitea/conf
-
-            # prepare temp directory structure
-            mkdir -p "${GITEA_TEMP}"
-            chown 1000:1000 "${GITEA_TEMP}"
-            chmod ug+rwx "${GITEA_TEMP}"
-  - it: adds gpg script block for enabled signing
-    set:
-      signing.enabled: true
-    asserts:
-      - equal:
-          path: stringData.[init_directory_structure.sh]
-          value: |-
-            #!/usr/bin/env bash
-
-            set -euo pipefail
-
-            set -x
-            chown 1000:1000 /data
-            mkdir -p /data/git/.ssh
-            chmod -R 700 /data/git/.ssh
-            [ ! -d /data/gitea/conf ] && mkdir -p /data/gitea/conf
-
-            # prepare temp directory structure
-            mkdir -p "${GITEA_TEMP}"
-            chown 1000:1000 "${GITEA_TEMP}"
-            chmod ug+rwx "${GITEA_TEMP}"
-
-            if [ ! -d "${GNUPGHOME}" ]; then
-              mkdir -p "${GNUPGHOME}"
-              chmod 700 "${GNUPGHOME}"
-              chown 1000:1000 "${GNUPGHOME}"
-            fi