Configurable dev environment (#14869)

* Configurable dev environment

* Add a bit of documentation

* fixing gofmt

* A bit more doc

* Using  variable

* Adding license header

* Moving LDAP_DATA variable to the default-config.mk file

* Adding another docker-compose for the makefile to not brake anybody workflow

* Moving dejavu to the config

* Fixing docker-compose.makefile.yaml for dejavu

* Adding keycloak support to the dev environment

* Address PR review comments

* Removing minio from default docker images

* Changing the default version of mysql to the oldest supported (5.6)

* Change the restart option to no for the dev environment

* Fixing restart option

* Reverting unneded changes

* Restoring 5.7 to check if test passes

* Going back to 5.6 mysql image

* Fixing tests on mysql 5.6

* Skipping flaky test

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

build/docker/keycloak/README.md

@@ -0,0 +1,58 @@
+To use this keycloak image, we suggest you to use this configuration settings:
+
+- Enable Login With SAML 2.0: `true`
+- Enable Synchronizing SAML Accounts With AD/LDAP: `true`
+- Override SAML bind data with AD/LDAP information: `false`
+- Identity Provider Metadata URL: empty string
+- SAML SSO URL: `http://localhost:8484/auth/realms/mattermost/protocol/saml`
+- Identity Provider Issuer URL: h`ttp://localhost:8065/login/sso/SAML`
+- Identity Provider Public Certificate: The file `keycloak_cert.pem` in this same directory
+- Verify Signature: `true`
+- Service Provider Login URL: `http://localhost:8065/login/sso/saml`
+- Enable Encryption: `false`
+- Sign Request: `false`
+- Email Attribute: `email`
+- Username Attribute: `username`
+- Id Attribute: `id`
+- First Name Attribute: `firstName`
+- Last Name Attribute: `lastName`
+
+or overwrite your SamleSettings section with this settings in your config.json file (if you are not using
+database configuration) and restart the server:
+
+```json
+    "SamlSettings": {
+        "Enable": true,
+        "EnableSyncWithLdap": true,
+        "EnableSyncWithLdapIncludeAuth": false,
+        "Verify": true,
+        "Encrypt": false,
+        "SignRequest": false,
+        "IdpUrl": "http://localhost:8484/auth/realms/mattermost/protocol/saml",
+        "IdpDescriptorUrl": "http://localhost:8065/login/sso/saml",
+        "IdpMetadataUrl": "",
+        "AssertionConsumerServiceURL": "http://localhost:8065/login/sso/saml",
+        "SignatureAlgorithm": "RSAwithSHA1",
+        "CanonicalAlgorithm": "Canonical1.0",
+        "ScopingIDPProviderId": "",
+        "ScopingIDPName": "",
+        "IdpCertificateFile": "saml-idp.crt",
+        "PublicCertificateFile": "",
+        "PrivateKeyFile": "",
+        "IdAttribute": "id",
+        "GuestAttribute": "",
+        "EnableAdminAttribute": false,
+        "AdminAttribute": "",
+        "FirstNameAttribute": "firstName",
+        "LastNameAttribute": "lastName",
+        "EmailAttribute": "email",
+        "UsernameAttribute": "username",
+        "NicknameAttribute": "",
+        "LocaleAttribute": "",
+        "PositionAttribute": "",
+        "LoginButtonText": "SAML",
+        "LoginButtonColor": "#34a28b",
+        "LoginButtonBorderColor": "#2389D7",
+        "LoginButtonTextColor": "#ffffff"
+    },
+```

build/docker/keycloak/keycloak_cert.pem

@@ -0,0 +1,3 @@
+-----BEGIN CERTIFICATE-----
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
+-----END CERTIFICATE-----